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18x-21x=12-x
We simplify the equation to the form, which is simple to understand
18x-21x=12-x
We move all terms containing x to the left and all other terms to the right.
+18x-21x+1x=+12
We simplify left and right side of the equation.
-2x=+12
We divide both sides of the equation by -2 to get x.
x=-6
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