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43=-12-5b
We move all terms to the left:
43-(-12-5b)=0
We add all the numbers together, and all the variables
-(-5b-12)+43=0
We get rid of parentheses
5b+12+43=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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