-2(1-a)=-20-7a

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Solution for -2(1-a)=-20-7a equation: 



-2(1-a)=-20-7a

We move all terms to the left:

-2(1-a)-(-20-7a)=0

We add all the numbers together, and all the variables

-2(-1a+1)-(-7a-20)=0

We multiply parentheses

2a-(-7a-20)-2=0

We get rid of parentheses

2a+7a+20-2=0

We add all the numbers together, and all the variables

9a+18=0

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

9a=-18

a=-18/9

a=-2

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