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30=-5(b+20)
We move all terms to the left:
30-(-5(b+20))=0
We calculate terms in parentheses: -(-5(b+20)), so:We get rid of parentheses
-5(b+20)
We multiply parentheses
-5b-100
Back to the equation:
-(-5b-100)
5b+100+30=0
We add all the numbers together, and all the variables
5b+130=0
We move all terms containing b to the left, all other terms to the right
5b=-130
b=-130/5
b=-26
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