f(-3)=12-7

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Solution for f(-3)=12-7 equation: 



f(-3)=12-7

We move all terms to the left:

f(-3)-(12-7)=0

We add all the numbers together, and all the variables

f(-3)-5=0

We multiply parentheses

-3f-5=0

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

-3f=5

f=5/-3

f=-1+2/3

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