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4-y-9=15
We simplify the equation to the form, which is simple to understand
4-y-9=15
We move all terms containing y to the left and all other terms to the right.
-1y=+15-4+9
We simplify left and right side of the equation.
-1y=+20
We divide both sides of the equation by -1 to get y.
y=-20
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