X+4y=27=X+2y=21

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Solution for X+4y=27=X+2y=21 equation: 



X+4X=27=X+2X=21

We move all terms to the left:

X+4X-(27)=0

We add all the numbers together, and all the variables

5X-27=0

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

5X=27

X=27/5

X=5+2/5

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