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4+13b=16b+7
We move all terms to the left:
4+13b-(16b+7)=0
We get rid of parentheses
13b-16b-7+4=0
We add all the numbers together, and all the variables
-3b-3=0
We move all terms containing b to the left, all other terms to the right
-3b=3
b=3/-3
b=-1
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