3X=20-y

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Solution for 3X=20-y equation: 



3X=20-X

We move all terms to the left:

3X-(20-X)=0

We add all the numbers together, and all the variables

3X-(-1X+20)=0

We get rid of parentheses

3X+1X-20=0

We add all the numbers together, and all the variables

4X-20=0

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

4X=20

X=20/4

X=5

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