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120+120+120+100+x=720
We simplify the equation to the form, which is simple to understand
120+120+120+100+x=720
We move all terms containing x to the left and all other terms to the right.
+1x=+720-120-120-120-100
We simplify left and right side of the equation.
+1x=+260
We divide both sides of the equation by 1 to get x.
x=260
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