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5y-15=-7+7y
We simplify the equation to the form, which is simple to understand
5y-15=-7+7y
We move all terms containing y to the left and all other terms to the right.
+5y-7y=-7+15
We simplify left and right side of the equation.
-2y=+8
We divide both sides of the equation by -2 to get y.
y=-4
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