3-7(7-b)=-102

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Solution for 3-7(7-b)=-102 equation: 



3-7(7-b)=-102

We move all terms to the left:

3-7(7-b)-(-102)=0

We add all the numbers together, and all the variables

-7(-1b+7)+3-(-102)=0

We add all the numbers together, and all the variables

-7(-1b+7)+105=0

We multiply parentheses

7b-49+105=0

We add all the numbers together, and all the variables

7b+56=0

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

7b=-56

b=-56/7

b=-8

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