f(-4)=5-12

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Solution for f(-4)=5-12 equation: 



f(-4)=5-12

We move all terms to the left:

f(-4)-(5-12)=0

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

f(-4)+7=0

We multiply parentheses

-4f+7=0

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

-4f=-7

f=-7/-4

f=1+3/4

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