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40+4\left(41-40\right)-2\times 4a-\left(4a-\left(-20\right)\right)=0
Multiply both sides of the equation by 8, the least common multiple of 2,4,8.
40+4\times 1-2\times 4a-\left(4a-\left(-20\right)\right)=0
Subtract 40 from 41 to get 1.
40+4-2\times 4a-\left(4a-\left(-20\right)\right)=0
Multiply 4 and 1 to get 4.
44-2\times 4a-\left(4a-\left(-20\right)\right)=0
Add 40 and 4 to get 44.
44-8a-\left(4a-\left(-20\right)\right)=0
Multiply -2 and 4 to get -8.
44-8a-\left(4a+20\right)=0
The opposite of -20 is 20.
44-8a-4a-20=0
To find the opposite of 4a+20, find the opposite of each term.
44-12a-20=0
Combine -8a and -4a to get -12a.
24-12a=0
Subtract 20 from 44 to get 24.
-12a=-24
Subtract 24 from both sides. Anything subtracted from zero gives its negation.
a=\frac{-24}{-12}
Divide both sides by -12.
a=2
Divide -24 by -12 to get 2.