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3b-13+4b=7b+1b=
We move all terms to the left:
3b-13+4b-(7b+1b)=0
We add all the numbers together, and all the variables
3b+4b-(+8b)-13=0
We add all the numbers together, and all the variables
7b-(+8b)-13=0
We get rid of parentheses
7b-8b-13=0
We add all the numbers together, and all the variables
-1b-13=0
We move all terms containing b to the left, all other terms to the right
-b=13
b=13/-1
b=-13
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