X=300-20y

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Solution for X=300-20y equation: 



X=300-20X

We move all terms to the left:

X-(300-20X)=0

We add all the numbers together, and all the variables

X-(-20X+300)=0

We get rid of parentheses

X+20X-300=0

We add all the numbers together, and all the variables

21X-300=0

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

21X=300

X=300/21

X=14+2/7

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