13b+(-9b)+12b+(-7b)=18

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Solution for 13b+(-9b)+12b+(-7b)=18 equation: 



13b+(-9b)+12b+(-7b)=18

We move all terms to the left:

13b+(-9b)+12b+(-7b)-(18)=0

We add all the numbers together, and all the variables

25b+(-9b)+(-7b)-18=0

We get rid of parentheses

25b-9b-7b-18=0

We add all the numbers together, and all the variables

9b-18=0

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

9b=18

b=18/9

b=2

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