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4x-40+(-2x)=40
We simplify the equation to the form, which is simple to understand
4x-40+(-2x)=40
Remove unnecessary parentheses
+4x-40-2x=+40
We move all terms containing x to the left and all other terms to the right.
+4x-2x=+40+40
We simplify left and right side of the equation.
+2x=+80
We divide both sides of the equation by 2 to get x.
x=40
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