-19+2z=21

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Solution for -19+2z=21 equation: 



-19+2z=21

We move all terms to the left:

-19+2z-(21)=0

We add all the numbers together, and all the variables

2z-40=0

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

2z=40

z=40/2

z=20

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