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-42-x=18-3x
We simplify the equation to the form, which is simple to understand
-42-x=18-3x
We move all terms containing x to the left and all other terms to the right.
-1x+3x=+18+42
We simplify left and right side of the equation.
+2x=+60
We divide both sides of the equation by 2 to get x.
x=30
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