7*9=(7*10)-(7*z)

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Solution for 7*9=(7*10)-(7*z) equation: 



7*9=(7*10)-(7z)

We move all terms to the left:

7*9-((7*10)-(7z))=0

We add all the numbers together, and all the variables

-(70-7z)+7*9=0

We add all the numbers together, and all the variables

-(70-7z)+63=0

We get rid of parentheses

7z-70+63=0

We add all the numbers together, and all the variables

7z-7=0

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

7z=7

z=7/7

z=1

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