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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

f(-2)-(4(-5))=0

We add all the numbers together, and all the variables

f(-2)+20=0

We multiply parentheses

-2f+20=0

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

-2f=-20

f=-20/-2

f=+10

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