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x+x+30+x+60=180
We simplify the equation to the form, which is simple to understand
x+x+30+x+60=180
We move all terms containing x to the left and all other terms to the right.
+1x+1x+1x=+180-30-60
We simplify left and right side of the equation.
+3x=+90
We divide both sides of the equation by 3 to get x.
x=30
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