20.55=X+2y

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Solution for 20.55=X+2y equation: 



20.55=X+2X

We move all terms to the left:

20.55-(X+2X)=0

We add all the numbers together, and all the variables

-(+3X)+20.55=0

We get rid of parentheses

-3X+20.55=0

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

-3X=-20.55

X=-20.55/-3

X=6+2.55/3

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