f(-3)=7X-4

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Solution for f(-3)=7X-4 equation: 



f(-3)=7f-4

We move all terms to the left:

f(-3)-(7f-4)=0

We multiply parentheses

-3f-(7f-4)=0

We get rid of parentheses

-3f-7f+4=0

We add all the numbers together, and all the variables

-10f+4=0

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

-10f=-4

f=-4/-10

f=2/5

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