9=7+y

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Solution for 9=7+y equation: 



9=7+y

We move all terms to the left:

9-(7+y)=0

We add all the numbers together, and all the variables

-(y+7)+9=0

We get rid of parentheses

-y-7+9=0

We add all the numbers together, and all the variables

-1y+2=0

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

-y=-2

y=-2/-1

y=+2

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