21y-9=180

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Solution for 21y-9=180 equation: 



21y-9=180

We move all terms to the left:

21y-9-(180)=0

We add all the numbers together, and all the variables

21y-189=0

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

21y=189

y=189/21

y=9

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