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215=-5(6b-7)
We move all terms to the left:
215-(-5(6b-7))=0
We calculate terms in parentheses: -(-5(6b-7)), so:We get rid of parentheses
-5(6b-7)
We multiply parentheses
-30b+35
Back to the equation:
-(-30b+35)
30b-35+215=0
We add all the numbers together, and all the variables
30b+180=0
We move all terms containing b to the left, all other terms to the right
30b=-180
b=-180/30
b=-6
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