7*7-9=z

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Solution for 7*7-9=z equation: 



7*7-9=z

We move all terms to the left:

7*7-9-(z)=0

We add all the numbers together, and all the variables

-1z+40=0

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

-z=-40

z=-40/-1

z=+40

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