9=4+y

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Solution for 9=4+y equation: 



9=4+y

We move all terms to the left:

9-(4+y)=0

We add all the numbers together, and all the variables

-(y+4)+9=0

We get rid of parentheses

-y-4+9=0

We add all the numbers together, and all the variables

-1y+5=0

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

-y=-5

y=-5/-1

y=+5

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