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840=(x+20)12
We simplify the equation to the form, which is simple to understand
840=(x+20)12
Reorder the terms in parentheses
840=(+12x+240)
Remove unnecessary parentheses
840=+12x+240
We move all terms containing x to the left and all other terms to the right.
-12x=+240-840
We simplify left and right side of the equation.
-12x=-600
We divide both sides of the equation by -012 to get x.
x=50
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