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x+x-42=0
We simplify the equation to the form, which is simple to understand
x+x-42=0
We move all terms containing x to the left and all other terms to the right.
+1x+1x=0+42
We simplify left and right side of the equation.
+2x=+42
We divide both sides of the equation by 2 to get x.
x=21
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