2z=21-39

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Solution for 2z=21-39 equation: 



2z=21-39

We move all terms to the left:

2z-(21-39)=0

We add all the numbers together, and all the variables

2z-(-18)=0

We add all the numbers together, and all the variables

2z+18=0

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

2z=-18

z=-18/2

z=-9

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