f(-7)=-28+20

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Solution for f(-7)=-28+20 equation: 



f(-7)=-28+20

We move all terms to the left:

f(-7)-(-28+20)=0

We add all the numbers together, and all the variables

f(-7)-(-8)=0

We add all the numbers together, and all the variables

f(-7)+8=0

We multiply parentheses

-7f+8=0

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

-7f=-8

f=-8/-7

f=1+1/7

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