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15b+40=5b+12
We move all terms to the left:
15b+40-(5b+12)=0
We get rid of parentheses
15b-5b-12+40=0
We add all the numbers together, and all the variables
10b+28=0
We move all terms containing b to the left, all other terms to the right
10b=-28
b=-28/10
b=-2+4/5
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