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70=-15+b
We move all terms to the left:
70-(-15+b)=0
We add all the numbers together, and all the variables
-(b-15)+70=0
We get rid of parentheses
-b+15+70=0
We add all the numbers together, and all the variables
-1b+85=0
We move all terms containing b to the left, all other terms to the right
-b=-85
b=-85/-1
b=+85
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