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12x+2+6x-2=90
We simplify the equation to the form, which is simple to understand
12x+2+6x-2=90
We move all terms containing x to the left and all other terms to the right.
+12x+6x=+90-2+2
We simplify left and right side of the equation.
+18x=+90
We divide both sides of the equation by 18 to get x.
x=5
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