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b+5=-8+2b-7+4b
We move all terms to the left:
b+5-(-8+2b-7+4b)=0
We add all the numbers together, and all the variables
b-(6b-15)+5=0
We get rid of parentheses
b-6b+15+5=0
We add all the numbers together, and all the variables
-5b+20=0
We move all terms containing b to the left, all other terms to the right
-5b=-20
b=-20/-5
b=+4
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