f(-1)=5(-1)-18

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Solution for f(-1)=5(-1)-18 equation: 



f(-1)=5(-1)-18

We move all terms to the left:

f(-1)-(5(-1)-18)=0

We add all the numbers together, and all the variables

f(-1)+23=0

We multiply parentheses

-1f+23=0

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

-f=-23

f=-23/-1

f=+23

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