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-6(1+3b)=84
We move all terms to the left:
-6(1+3b)-(84)=0
We add all the numbers together, and all the variables
-6(3b+1)-84=0
We multiply parentheses
-18b-6-84=0
We add all the numbers together, and all the variables
-18b-90=0
We move all terms containing b to the left, all other terms to the right
-18b=90
b=90/-18
b=-5
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