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-5(3+3b)=-90
We move all terms to the left:
-5(3+3b)-(-90)=0
We add all the numbers together, and all the variables
-5(3b+3)-(-90)=0
We add all the numbers together, and all the variables
-5(3b+3)+90=0
We multiply parentheses
-15b-15+90=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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