f(-2)=2-3

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



f(-2)=2-3

We move all terms to the left:

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

We add all the numbers together, and all the variables

f(-2)-(-1)=0

We add all the numbers together, and all the variables

f(-2)+1=0

We multiply parentheses

-2f+1=0

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

-2f=-1

f=-1/-2

f=1/2

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