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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

f(-3)-(-21)=0

We add all the numbers together, and all the variables

f(-3)+21=0

We multiply parentheses

-3f+21=0

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

-3f=-21

f=-21/-3

f=+7

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