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5x+12=42-x
We simplify the equation to the form, which is simple to understand
5x+12=42-x
We move all terms containing x to the left and all other terms to the right.
+5x+1x=+42-12
We simplify left and right side of the equation.
+6x=+30
We divide both sides of the equation by 6 to get x.
x=5
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