7a-(4-a)=20

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Solution for 7a-(4-a)=20 equation: 



7a-(4-a)=20

We move all terms to the left:

7a-(4-a)-(20)=0

We add all the numbers together, and all the variables

7a-(-1a+4)-20=0

We get rid of parentheses

7a+1a-4-20=0

We add all the numbers together, and all the variables

8a-24=0

We move all terms containing a to the left, all other terms to the right

8a=24

a=24/8

a=3

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