f(-1)=5*(-1)+15

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Solution for f(-1)=5*(-1)+15 equation: 



f(-1)=5(-1)+15

We move all terms to the left:

f(-1)-(5(-1)+15)=0

We add all the numbers together, and all the variables

f(-1)-10=0

We multiply parentheses

-1f-10=0

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

-f=10

f=10/-1

f=-10

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