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