(-2y)-y=9

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Solution for (-2y)-y=9 equation: 



(-2y)-y=9

We move all terms to the left:

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

We add all the numbers together, and all the variables

-1y+(-2y)-9=0

We get rid of parentheses

-1y-2y-9=0

We add all the numbers together, and all the variables

-3y-9=0

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

-3y=9

y=9/-3

y=-3

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