20=13y-9y

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Solution for 20=13y-9y equation: 



20=13y-9y

We move all terms to the left:

20-(13y-9y)=0

We add all the numbers together, and all the variables

-(+4y)+20=0

We get rid of parentheses

-4y+20=0

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

-4y=-20

y=-20/-4

y=+5

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