-z-3z=-12

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Solution for -z-3z=-12 equation: 



-z-3z=-12

We move all terms to the left:

-z-3z-(-12)=0

We add all the numbers together, and all the variables

-4z+12=0

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

-4z=-12

z=-12/-4

z=+3

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