20+20y=640

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Solution for 20+20y=640 equation: 



20+20y=640

We move all terms to the left:

20+20y-(640)=0

We add all the numbers together, and all the variables

20y-620=0

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

20y=620

y=620/20

y=31

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