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120+120+120+120+120+x=180
We simplify the equation to the form, which is simple to understand
120+120+120+120+120+x=180
We move all terms containing x to the left and all other terms to the right.
+1x=+180-120-120-120-120-120
We simplify left and right side of the equation.
+1x=-420
We divide both sides of the equation by 1 to get x.
x=-420
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