9=3*7+y

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Solution for 9=3*7+y equation: 



9=3*7+y

We move all terms to the left:

9-(3*7+y)=0

We add all the numbers together, and all the variables

-(y+21)+9=0

We get rid of parentheses

-y-21+9=0

We add all the numbers together, and all the variables

-1y-12=0

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

-y=12

y=12/-1

y=-12

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