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20+3b=-4b-15
We move all terms to the left:
20+3b-(-4b-15)=0
We get rid of parentheses
3b+4b+15+20=0
We add all the numbers together, and all the variables
7b+35=0
We move all terms containing b to the left, all other terms to the right
7b=-35
b=-35/7
b=-5
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