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x=18+3.5x
We move all terms to the left:
x-(18+3.5x)=0
We add all the numbers together, and all the variables
x-(3.5x+18)=0
We get rid of parentheses
x-3.5x-18=0
We add all the numbers together, and all the variables
-2.5x-18=0
We move all terms containing x to the left, all other terms to the right
-2.5x=18
x=18/-2.5
x=-7+0.5/2.5
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