4a-7(a-9)=31-7a

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Solution for 4a-7(a-9)=31-7a equation: 



4a-7(a-9)=31-7a

We move all terms to the left:

4a-7(a-9)-(31-7a)=0

We add all the numbers together, and all the variables

4a-7(a-9)-(-7a+31)=0

We multiply parentheses

4a-7a-(-7a+31)+63=0

We get rid of parentheses

4a-7a+7a-31+63=0

We add all the numbers together, and all the variables

4a+32=0

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

4a=-32

a=-32/4

a=-8

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