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9y+y-12y=0
We simplify the equation to the form, which is simple to understand
9y+y-12y=0
We move all terms containing y to the left and all other terms to the right.
+9y+1y-12y=0
We simplify left and right side of the equation.
-2y=0
We divide both sides of the equation by -2 to get y.
y=-0
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