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40=10(b+2)
We move all terms to the left:
40-(10(b+2))=0
We calculate terms in parentheses: -(10(b+2)), so:We get rid of parentheses
10(b+2)
We multiply parentheses
10b+20
Back to the equation:
-(10b+20)
-10b-20+40=0
We add all the numbers together, and all the variables
-10b+20=0
We move all terms containing b to the left, all other terms to the right
-10b=-20
b=-20/-10
b=+2
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