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-51=-5b+4
We move all terms to the left:
-51-(-5b+4)=0
We get rid of parentheses
5b-4-51=0
We add all the numbers together, and all the variables
5b-55=0
We move all terms containing b to the left, all other terms to the right
5b=55
b=55/5
b=11
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