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80+x+51+x+71=180
We simplify the equation to the form, which is simple to understand
80+x+51+x+71=180
We move all terms containing x to the left and all other terms to the right.
+1x+1x=+180-80-51-71
We simplify left and right side of the equation.
+2x=-22
We divide both sides of the equation by 2 to get x.
x=-11
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