9y+4-1=21

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Solution for 9y+4-1=21 equation: 



9y+4-1=21

We move all terms to the left:

9y+4-1-(21)=0

We add all the numbers together, and all the variables

9y-18=0

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

9y=18

y=18/9

y=2

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