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-4=-3+8-b
We move all terms to the left:
-4-(-3+8-b)=0
We add all the numbers together, and all the variables
-(-1b+5)-4=0
We get rid of parentheses
1b-5-4=0
We add all the numbers together, and all the variables
b-9=0
We move all terms containing b to the left, all other terms to the right
b=9
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