-9y-21=3(y-3)

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Solution for -9y-21=3(y-3) equation:


-9y-21=3(y-3)

We simplify the equation to the form, which is simple to understand 
-9y-21=3(y-3)

Reorder the terms in parentheses
-9y-21=+(+3y-9)

Remove unnecessary parentheses
-9y-21=+3y-9

We move all terms containing y to the left and all other terms to the right. 
-9y-3y=-9+21

We simplify left and right side of the equation. 
-12y=+12

We divide both sides of the equation by -12 to get y. 
y=-1

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