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720=6x+6(x+20)
We simplify the equation to the form, which is simple to understand
720=6x+6(x+20)
Reorder the terms in parentheses
720=6x+(+6x+120)
Remove unnecessary parentheses
+720=+6x+6x+120
We move all terms containing x to the left and all other terms to the right.
-6x-6x=+120-720
We simplify left and right side of the equation.
-12x=-600
We divide both sides of the equation by -12 to get x.
x=50
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