-4z=-21

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Solution for -4z=-21 equation: 



-4z=-21

We move all terms to the left:

-4z-(-21)=0

We add all the numbers together, and all the variables

-4z+21=0

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

-4z=-21

z=-21/-4

z=5+1/4

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