y+y+7y=180

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Solution for y+y+7y=180 equation: 



y+y+7y=180

We move all terms to the left:

y+y+7y-(180)=0

We add all the numbers together, and all the variables

9y-180=0

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

9y=180

y=180/9

y=20

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