-y-3y=-18

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Solution for -y-3y=-18 equation: 



-y-3y=-18

We move all terms to the left:

-y-3y-(-18)=0

We add all the numbers together, and all the variables

-4y+18=0

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

-4y=-18

y=-18/-4

y=4+1/2

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