SOLUTION: what is 12y+21=9y? i know the answer is -7 but i dont know how to find the answer or how to do the promblem please help!!!

Question 565195: what is 12y+21=9y? i know the answer is -7 but i dont know how to find the answer or how to do the promblem please help!!!
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Start with the given equation.

Subtract from both sides.

Subtract from both sides.

Combine like terms on the left side.

Divide both sides by to isolate .

Reduce.

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Answer:

So the solution is
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