f(-1)=3(-1)+7

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Solution for f(-1)=3(-1)+7 equation: 



f(-1)=3(-1)+7

We move all terms to the left:

f(-1)-(3(-1)+7)=0

We add all the numbers together, and all the variables

f(-1)-4=0

We multiply parentheses

-1f-4=0

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

-f=4

f=4/-1

f=-4

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