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20+12y=13y-21
We simplify the equation to the form, which is simple to understand
20+12y=13y-21
We move all terms containing y to the left and all other terms to the right.
+12y-13y=-21-20
We simplify left and right side of the equation.
-1y=-41
We divide both sides of the equation by -1 to get y.
y=41
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