-81=7y-2y+4y

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Solution for -81=7y-2y+4y equation: 



-81=7y-2y+4y

We move all terms to the left:

-81-(7y-2y+4y)=0

We add all the numbers together, and all the variables

-(+9y)-81=0

We get rid of parentheses

-9y-81=0

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

-9y=81

y=81/-9

y=-9

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