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7-5=13y+9-12y
We simplify the equation to the form, which is simple to understand
7-5=13y+9-12y
We move all terms containing y to the left and all other terms to the right.
-13y+12y=+9-7+5
We simplify left and right side of the equation.
-1y=+7
We divide both sides of the equation by -1 to get y.
y=-7
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