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15=-5b+3b
We move all terms to the left:
15-(-5b+3b)=0
We add all the numbers together, and all the variables
-(-2b)+15=0
We get rid of parentheses
2b+15=0
We move all terms containing b to the left, all other terms to the right
2b=-15
b=-15/2
b=-7+1/2
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