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225=5(4b+12)
We move all terms to the left:
225-(5(4b+12))=0
We calculate terms in parentheses: -(5(4b+12)), so:We get rid of parentheses
5(4b+12)
We multiply parentheses
20b+60
Back to the equation:
-(20b+60)
-20b-60+225=0
We add all the numbers together, and all the variables
-20b+165=0
We move all terms containing b to the left, all other terms to the right
-20b=-165
b=-165/-20
b=8+1/4
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