f(-1)=-2f-3

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Solution for f(-1)=-2f-3 equation: 



f(-1)=-2f-3

We move all terms to the left:

f(-1)-(-2f-3)=0

We multiply parentheses

-1f-(-2f-3)=0

We get rid of parentheses

-1f+2f+3=0

We add all the numbers together, and all the variables

f+3=0

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

f=-3

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