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18x-9=5(2x+3)
We move all terms to the left:
18x-9-(5(2x+3))=0
We calculate terms in parentheses: -(5(2x+3)), so:We get rid of parentheses
5(2x+3)
We multiply parentheses
10x+15
Back to the equation:
-(10x+15)
18x-10x-15-9=0
We add all the numbers together, and all the variables
8x-24=0
We move all terms containing x to the left, all other terms to the right
8x=24
x=24/8
x=3
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