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

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



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

We move all terms to the left:

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