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18-1x-2x=63
We simplify the equation to the form, which is simple to understand
18-1x-2x=63
We move all terms containing x to the left and all other terms to the right.
-1x-2x=+63-18
We simplify left and right side of the equation.
-3x=+45
We divide both sides of the equation by -3 to get x.
x=-15
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