f(-2)=3(-2)-4

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Solution for f(-2)=3(-2)-4 equation: 



f(-2)=3(-2)-4

We move all terms to the left:

f(-2)-(3(-2)-4)=0

We add all the numbers together, and all the variables

f(-2)+10=0

We multiply parentheses

-2f+10=0

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

-2f=-10

f=-10/-2

f=+5

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