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(13b-1)-4(3b+1)=-7
We move all terms to the left:
(13b-1)-4(3b+1)-(-7)=0
We add all the numbers together, and all the variables
(13b-1)-4(3b+1)+7=0
We multiply parentheses
(13b-1)-12b-4+7=0
We get rid of parentheses
13b-12b-1-4+7=0
We add all the numbers together, and all the variables
b+2=0
We move all terms containing b to the left, all other terms to the right
b=-2
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