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225=9(3x+10)
We move all terms to the left:
225-(9(3x+10))=0
We calculate terms in parentheses: -(9(3x+10)), so:We get rid of parentheses
9(3x+10)
We multiply parentheses
27x+90
Back to the equation:
-(27x+90)
-27x-90+225=0
We add all the numbers together, and all the variables
-27x+135=0
We move all terms containing x to the left, all other terms to the right
-27x=-135
x=-135/-27
x=+5
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