9+y+y=8

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Solution for 9+y+y=8 equation: 



9+y+y=8

We move all terms to the left:

9+y+y-(8)=0

We add all the numbers together, and all the variables

2y+1=0

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

2y=-1

y=-1/2

y=-1/2

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