f(-2)=-1(-2-7)+3

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Solution for f(-2)=-1(-2-7)+3 equation: 



f(-2)=-1(-2-7)+3

We move all terms to the left:

f(-2)-(-1(-2-7)+3)=0

We add all the numbers together, and all the variables

f(-2)-(-1(-9)+3)=0

We add all the numbers together, and all the variables

f(-2)-12=0

We multiply parentheses

-2f-12=0

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

-2f=12

f=12/-2

f=-6

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