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77+x+x+42+65=180
We simplify the equation to the form, which is simple to understand
77+x+x+42+65=180
We move all terms containing x to the left and all other terms to the right.
+1x+1x=+180-77-42-65
We simplify left and right side of the equation.
+2x=-4
We divide both sides of the equation by 2 to get x.
x=-2
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