20-2y+20-2y+20-2y=30

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Solution for 20-2y+20-2y+20-2y=30 equation: 



20-2y+20-2y+20-2y=30

We move all terms to the left:

20-2y+20-2y+20-2y-(30)=0

We add all the numbers together, and all the variables

-6y+30=0

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

-6y=-30

y=-30/-6

y=+5

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