f(-21)=-2(-21)+3

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Solution for f(-21)=-2(-21)+3 equation: 



f(-21)=-2(-21)+3

We move all terms to the left:

f(-21)-(-2(-21)+3)=0

We add all the numbers together, and all the variables

f(-21)-45=0

We multiply parentheses

-21f-45=0

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

-21f=45

f=45/-21

f=-2+1/7

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