y+9=-y-9

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Solution for y+9=-y-9 equation: 



y+9=-y-9

We move all terms to the left:

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

We add all the numbers together, and all the variables

y-(-1y-9)+9=0

We get rid of parentheses

y+1y+9+9=0

We add all the numbers together, and all the variables

2y+18=0

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

2y=-18

y=-18/2

y=-9

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