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