f(-2)=(12+3)

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Solution for f(-2)=(12+3) equation: 



f(-2)=(12+3)

We move all terms to the left:

f(-2)-((12+3))=0

We add all the numbers together, and all the variables

f(-2)-(15)=0

We add all the numbers together, and all the variables

f(-2)-15=0

We multiply parentheses

-2f-15=0

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

-2f=15

f=15/-2

f=-7+1/2

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