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y+y-30+90=180
We simplify the equation to the form, which is simple to understand
y+y-30+90=180
We move all terms containing y to the left and all other terms to the right.
+1y+1y=+180+30-90
We simplify left and right side of the equation.
+2y=+120
We divide both sides of the equation by 2 to get y.
y=60
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