3+9=y+1

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Solution for 3+9=y+1 equation: 



3+9=y+1

We move all terms to the left:

3+9-(y+1)=0

We add all the numbers together, and all the variables

-(y+1)+12=0

We get rid of parentheses

-y-1+12=0

We add all the numbers together, and all the variables

-1y+11=0

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

-y=-11

y=-11/-1

y=+11

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