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-3b+13=-2b
We move all terms to the left:
-3b+13-(-2b)=0
We get rid of parentheses
-3b+2b+13=0
We add all the numbers together, and all the variables
-1b+13=0
We move all terms containing b to the left, all other terms to the right
-b=-13
b=-13/-1
b=+13
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