3y-4y=9

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Solution for 3y-4y=9 equation: 



3y-4y=9

We move all terms to the left:

3y-4y-(9)=0

We add all the numbers together, and all the variables

-1y-9=0

We move all terms containing y to the left, all other terms to the right

-y=9

y=9/-1

y=-9

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