7-z=20-7

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Solution for 7-z=20-7 equation: 



7-z=20-7

We move all terms to the left:

7-z-(20-7)=0

We add all the numbers together, and all the variables

-z+7-13=0

We add all the numbers together, and all the variables

-1z-6=0

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

-z=6

z=6/-1

z=-6

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