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225=5(4b+13)
We move all terms to the left:
225-(5(4b+13))=0
We calculate terms in parentheses: -(5(4b+13)), so:We get rid of parentheses
5(4b+13)
We multiply parentheses
20b+65
Back to the equation:
-(20b+65)
-20b-65+225=0
We add all the numbers together, and all the variables
-20b+160=0
We move all terms containing b to the left, all other terms to the right
-20b=-160
b=-160/-20
b=+8
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