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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-(70-7f)+63=0

We get rid of parentheses

7f-70+63=0

We add all the numbers together, and all the variables

7f-7=0

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

7f=7

f=7/7

f=1

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