f(-3)=2(-3)-3

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Solution for f(-3)=2(-3)-3 equation: 



f(-3)=2(-3)-3

We move all terms to the left:

f(-3)-(2(-3)-3)=0

We add all the numbers together, and all the variables

f(-3)+9=0

We multiply parentheses

-3f+9=0

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

-3f=-9

f=-9/-3

f=+3

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