21-3*2y=9

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Solution for 21-3*2y=9 equation: 



21-3*2y=9

We move all terms to the left:

21-3*2y-(9)=0

We add all the numbers together, and all the variables

-3*2y+12=0

Wy multiply elements

-6y+12=0

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

-6y=-12

y=-12/-6

y=+2

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