7z-9=40

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Solution for 7z-9=40 equation: 



7z-9=40

We move all terms to the left:

7z-9-(40)=0

We add all the numbers together, and all the variables

7z-49=0

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

7z=49

z=49/7

z=7

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