-x-3x-5=15

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Solution for -x-3x-5=15 equation: 



-x-3x-5=15

We move all terms to the left:

-x-3x-5-(15)=0

We add all the numbers together, and all the variables

-4x-20=0

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

-4x=20

x=20/-4

x=-5

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