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18-3x=6x+90
We simplify the equation to the form, which is simple to understand
18-3x=6x+90
We move all terms containing x to the left and all other terms to the right.
-3x-6x=+90-18
We simplify left and right side of the equation.
-9x=+72
We divide both sides of the equation by -9 to get x.
x=-8
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