2y-99-5y+9y=128-5y-7.

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Solution for 2y-99-5y+9y=128-5y-7. equation: 



2y-99-5y+9y=128-5y-7.

We move all terms to the left:

2y-99-5y+9y-(128-5y-7.)=0

We add all the numbers together, and all the variables

2y-5y+9y-(-5y+121)-99=0

We add all the numbers together, and all the variables

6y-(-5y+121)-99=0

We get rid of parentheses

6y+5y-121-99=0

We add all the numbers together, and all the variables

11y-220=0

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

11y=220

y=220/11

y=20

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