f*2=9*2^2-4*2

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Solution for f*2=9*2^2-4*2 equation: 



f*2=9*2^2-4*2

We move all terms to the left:

f*2-(9*2^2-4*2)=0

We add all the numbers together, and all the variables

f*2-28=0

Wy multiply elements

2f-28=0

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

2f=28

f=28/2

f=14

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