-12z-13z=-100

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Solution for -12z-13z=-100 equation: 



-12z-13z=-100

We move all terms to the left:

-12z-13z-(-100)=0

We add all the numbers together, and all the variables

-25z+100=0

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

-25z=-100

z=-100/-25

z=+4

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