X=21-0.5y

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Solution for X=21-0.5y equation: 



X=21-0.5X

We move all terms to the left:

X-(21-0.5X)=0

We add all the numbers together, and all the variables

X-(-0.5X+21)=0

We get rid of parentheses

X+0.5X-21=0

We add all the numbers together, and all the variables

1.5X-21=0

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

1.5X=21

X=21/1.5

X=14

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