y+y+20=80

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Solution for y+y+20=80 equation: 



y+y+20=80

We move all terms to the left:

y+y+20-(80)=0

We add all the numbers together, and all the variables

2y-60=0

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

2y=60

y=60/2

y=30

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