-3(4+5b)-3=-90

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Solution for -3(4+5b)-3=-90 equation: 



-3(4+5b)-3=-90

We move all terms to the left:

-3(4+5b)-3-(-90)=0

We add all the numbers together, and all the variables

-3(5b+4)-3-(-90)=0

We add all the numbers together, and all the variables

-3(5b+4)+87=0

We multiply parentheses

-15b-12+87=0

We add all the numbers together, and all the variables

-15b+75=0

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

-15b=-75

b=-75/-15

b=+5

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