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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-(70-7xx)+63=0

We get rid of parentheses

7xx-70+63=0

We add all the numbers together, and all the variables

7xx-7=0

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

7xx=7

x=7/1

x=7

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