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20=-2(6b+8)
We move all terms to the left:
20-(-2(6b+8))=0
We calculate terms in parentheses: -(-2(6b+8)), so:We get rid of parentheses
-2(6b+8)
We multiply parentheses
-12b-16
Back to the equation:
-(-12b-16)
12b+16+20=0
We add all the numbers together, and all the variables
12b+36=0
We move all terms containing b to the left, all other terms to the right
12b=-36
b=-36/12
b=-3
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