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-3y+9=-2(3y+9)
We simplify the equation to the form, which is simple to understand
-3y+9=-2(3y+9)
Reorder the terms in parentheses
-3y+9=+(-6y-18)
Remove unnecessary parentheses
-3y+9=-6y-18
We move all terms containing y to the left and all other terms to the right.
-3y+6y=-18-9
We simplify left and right side of the equation.
+3y=-27
We divide both sides of the equation by 3 to get y.
y=-9
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