3y*4+9=21

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Solution for 3y*4+9=21 equation: 



3y*4+9=21

We move all terms to the left:

3y*4+9-(21)=0

We add all the numbers together, and all the variables

3y*4-12=0

Wy multiply elements

12y-12=0

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

12y=12

y=12/12

y=1

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