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-15+2b=b+5-3b
We move all terms to the left:
-15+2b-(b+5-3b)=0
We add all the numbers together, and all the variables
2b-(-2b+5)-15=0
We get rid of parentheses
2b+2b-5-15=0
We add all the numbers together, and all the variables
4b-20=0
We move all terms containing b to the left, all other terms to the right
4b=20
b=20/4
b=5
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