21-2z=12

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Solution for 21-2z=12 equation: 



21-2z=12

We move all terms to the left:

21-2z-(12)=0

We add all the numbers together, and all the variables

-2z+9=0

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

-2z=-9

z=-9/-2

z=4+1/2

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