(12b+2b-b)-9=-87

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Solution for (12b+2b-b)-9=-87 equation: 



(12b+2b-b)-9=-87

We move all terms to the left:

(12b+2b-b)-9-(-87)=0

We add all the numbers together, and all the variables

(+13b)-9-(-87)=0

We add all the numbers together, and all the variables

(+13b)+78=0

We get rid of parentheses

13b+78=0

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

13b=-78

b=-78/13

b=-6

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