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13.5=18-3x
We move all terms to the left:
13.5-(18-3x)=0
We add all the numbers together, and all the variables
-(-3x+18)+13.5=0
We get rid of parentheses
3x-18+13.5=0
We add all the numbers together, and all the variables
3x-4.5=0
We move all terms containing x to the left, all other terms to the right
3x=4.5
x=4.5/3
x=1+1/2
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