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18-2.5x=3(4x+3)
We move all terms to the left:
18-2.5x-(3(4x+3))=0
We calculate terms in parentheses: -(3(4x+3)), so:We get rid of parentheses
3(4x+3)
We multiply parentheses
12x+9
Back to the equation:
-(12x+9)
-2.5x-12x-9+18=0
We add all the numbers together, and all the variables
-14.5x+9=0
We move all terms containing x to the left, all other terms to the right
-14.5x=-9
x=-9/-14.5
x=9/14.5
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