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

-(-1y+7)+9=0

We get rid of parentheses

1y-7+9=0

We add all the numbers together, and all the variables

y+2=0

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

y=-2

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