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x+2x-x=18
We simplify the equation to the form, which is simple to understand
x+2x-x=18
We move all terms containing x to the left and all other terms to the right.
+1x+2x-1x=+18
We simplify left and right side of the equation.
+2x=+18
We divide both sides of the equation by 2 to get x.
x=9
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