25-4z=+21

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Solution for 25-4z=+21 equation: 



25-4z=+21

We move all terms to the left:

25-4z-(+21)=0

We add all the numbers together, and all the variables

-4z+25-21=0

We add all the numbers together, and all the variables

-4z+4=0

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

-4z=-4

z=-4/-4

z=1

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