-3(1+3b)=-7b-15

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Solution for -3(1+3b)=-7b-15 equation: 



-3(1+3b)=-7b-15

We move all terms to the left:

-3(1+3b)-(-7b-15)=0

We add all the numbers together, and all the variables

-3(3b+1)-(-7b-15)=0

We multiply parentheses

-9b-(-7b-15)-3=0

We get rid of parentheses

-9b+7b+15-3=0

We add all the numbers together, and all the variables

-2b+12=0

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

-2b=-12

b=-12/-2

b=+6

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