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-285=-5(8+7b)
We move all terms to the left:
-285-(-5(8+7b))=0
We add all the numbers together, and all the variables
-(-5(7b+8))-285=0
We calculate terms in parentheses: -(-5(7b+8)), so:We get rid of parentheses
-5(7b+8)
We multiply parentheses
-35b-40
Back to the equation:
-(-35b-40)
35b+40-285=0
We add all the numbers together, and all the variables
35b-245=0
We move all terms containing b to the left, all other terms to the right
35b=245
b=245/35
b=7
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