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28+b=-2(b-2)
We move all terms to the left:
28+b-(-2(b-2))=0
We calculate terms in parentheses: -(-2(b-2)), so:We get rid of parentheses
-2(b-2)
We multiply parentheses
-2b+4
Back to the equation:
-(-2b+4)
b+2b-4+28=0
We add all the numbers together, and all the variables
3b+24=0
We move all terms containing b to the left, all other terms to the right
3b=-24
b=-24/3
b=-8
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