70-X=30+y

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Solution for 70-X=30+y equation: 



70-X=30+X

We move all terms to the left:

70-X-(30+X)=0

We add all the numbers together, and all the variables

-X-(X+30)+70=0

We add all the numbers together, and all the variables

-1X-(X+30)+70=0

We get rid of parentheses

-1X-X-30+70=0

We add all the numbers together, and all the variables

-2X+40=0

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

-2X=-40

X=-40/-2

X=+20

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