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y+9+2y=180
We simplify the equation to the form, which is simple to understand
y+9+2y=180
We move all terms containing y to the left and all other terms to the right.
+1y+2y=+180-9
We simplify left and right side of the equation.
+3y=+171
We divide both sides of the equation by 3 to get y.
y=57
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