f(-1)=2(-1)+5

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Solution for f(-1)=2(-1)+5 equation: 



f(-1)=2(-1)+5

We move all terms to the left:

f(-1)-(2(-1)+5)=0

We add all the numbers together, and all the variables

f(-1)-3=0

We multiply parentheses

-1f-3=0

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

-f=3

f=3/-1

f=-3

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