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4\left(7-\frac{1\times 2+1}{2}a\right)+2a-2\left(5\times 2+1\right)=8a+3-4\left(\frac{1}{2}+\frac{1}{2}a\right)
Multiply both sides of the equation by 4, the least common multiple of 2,4.
4\left(7-\frac{2+1}{2}a\right)+2a-2\left(5\times 2+1\right)=8a+3-4\left(\frac{1}{2}+\frac{1}{2}a\right)
Multiply 1 and 2 to get 2.
4\left(7-\frac{3}{2}a\right)+2a-2\left(5\times 2+1\right)=8a+3-4\left(\frac{1}{2}+\frac{1}{2}a\right)
Add 2 and 1 to get 3.
28+4\left(-\frac{3}{2}\right)a+2a-2\left(5\times 2+1\right)=8a+3-4\left(\frac{1}{2}+\frac{1}{2}a\right)
Use the distributive property to multiply 4 by 7-\frac{3}{2}a.
28+\frac{4\left(-3\right)}{2}a+2a-2\left(5\times 2+1\right)=8a+3-4\left(\frac{1}{2}+\frac{1}{2}a\right)
Express 4\left(-\frac{3}{2}\right) as a single fraction.
28+\frac{-12}{2}a+2a-2\left(5\times 2+1\right)=8a+3-4\left(\frac{1}{2}+\frac{1}{2}a\right)
Multiply 4 and -3 to get -12.
28-6a+2a-2\left(5\times 2+1\right)=8a+3-4\left(\frac{1}{2}+\frac{1}{2}a\right)
Divide -12 by 2 to get -6.
28-4a-2\left(5\times 2+1\right)=8a+3-4\left(\frac{1}{2}+\frac{1}{2}a\right)
Combine -6a and 2a to get -4a.
28-4a-2\left(10+1\right)=8a+3-4\left(\frac{1}{2}+\frac{1}{2}a\right)
Multiply 5 and 2 to get 10.
28-4a-2\times 11=8a+3-4\left(\frac{1}{2}+\frac{1}{2}a\right)
Add 10 and 1 to get 11.
28-4a-22=8a+3-4\left(\frac{1}{2}+\frac{1}{2}a\right)
Multiply -2 and 11 to get -22.
6-4a=8a+3-4\left(\frac{1}{2}+\frac{1}{2}a\right)
Subtract 22 from 28 to get 6.
6-4a=8a+3-4\times \frac{1}{2}-4\times \frac{1}{2}a
Use the distributive property to multiply -4 by \frac{1}{2}+\frac{1}{2}a.
6-4a=8a+3+\frac{-4}{2}-4\times \frac{1}{2}a
Multiply -4 and \frac{1}{2} to get \frac{-4}{2}.
6-4a=8a+3-2-4\times \frac{1}{2}a
Divide -4 by 2 to get -2.
6-4a=8a+3-2+\frac{-4}{2}a
Multiply -4 and \frac{1}{2} to get \frac{-4}{2}.
6-4a=8a+3-2-2a
Divide -4 by 2 to get -2.
6-4a=8a+1-2a
Subtract 2 from 3 to get 1.
6-4a=6a+1
Combine 8a and -2a to get 6a.
6-4a-6a=1
Subtract 6a from both sides.
6-10a=1
Combine -4a and -6a to get -10a.
-10a=1-6
Subtract 6 from both sides.
-10a=-5
Subtract 6 from 1 to get -5.
a=\frac{-5}{-10}
Divide both sides by -10.
a=\frac{1}{2}
Reduce the fraction \frac{-5}{-10} to lowest terms by extracting and canceling out -5.