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-7=5b-2
We move all terms to the left:
-7-(5b-2)=0
We get rid of parentheses
-5b+2-7=0
We add all the numbers together, and all the variables
-5b-5=0
We move all terms containing b to the left, all other terms to the right
-5b=5
b=5/-5
b=-1
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