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18x-9=6x+42
We simplify the equation to the form, which is simple to understand
18x-9=6x+42
We move all terms containing x to the left and all other terms to the right.
+18x-6x=+42+9
We simplify left and right side of the equation.
+12x=+51
We divide both sides of the equation by 12 to get x.
x=4.25
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