(12-z)X7=21

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Solution for (12-z)X7=21 equation: 



(12-z)z7=21

We move all terms to the left:

(12-z)z7-(21)=0

We add all the numbers together, and all the variables

(-1z+12)z7-21=0

We multiply parentheses

-1z^8+12z^7-21=0

We do not support ezpression: z^8

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