-1x-3x=-9

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Solution for -1x-3x=-9 equation: 



-1x-3x=-9

We move all terms to the left:

-1x-3x-(-9)=0

We add all the numbers together, and all the variables

-4x+9=0

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

-4x=-9

x=-9/-4

x=2+1/4

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