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-210=-6(-5b-5)
We move all terms to the left:
-210-(-6(-5b-5))=0
We calculate terms in parentheses: -(-6(-5b-5)), so:We get rid of parentheses
-6(-5b-5)
We multiply parentheses
30b+30
Back to the equation:
-(30b+30)
-30b-30-210=0
We add all the numbers together, and all the variables
-30b-240=0
We move all terms containing b to the left, all other terms to the right
-30b=240
b=240/-30
b=-8
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