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-142=-3b-5(8b-6)
We move all terms to the left:
-142-(-3b-5(8b-6))=0
We calculate terms in parentheses: -(-3b-5(8b-6)), so:We get rid of parentheses
-3b-5(8b-6)
We multiply parentheses
-3b-40b+30
We add all the numbers together, and all the variables
-43b+30
Back to the equation:
-(-43b+30)
43b-30-142=0
We add all the numbers together, and all the variables
43b-172=0
We move all terms containing b to the left, all other terms to the right
43b=172
b=172/43
b=4
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