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y+9=2y-80
We simplify the equation to the form, which is simple to understand
y+9=2y-80
We move all terms containing y to the left and all other terms to the right.
+1y-2y=-80-9
We simplify left and right side of the equation.
-1y=-89
We divide both sides of the equation by -1 to get y.
y=89
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