3y+9-y=8+y+4

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Solution for 3y+9-y=8+y+4 equation: 



3y+9-y=8+y+4

We move all terms to the left:

3y+9-y-(8+y+4)=0

We add all the numbers together, and all the variables

3y-y-(y+12)+9=0

We add all the numbers together, and all the variables

2y-(y+12)+9=0

We get rid of parentheses

2y-y-12+9=0

We add all the numbers together, and all the variables

y-3=0

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

y=3

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