2=4+f/-9 - solution

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Solution for 2=4+f/-9 equation:

f in (-oo:+oo)

2 = f/(-9)+4 // - f/(-9)+4

2-(f/(-9))-4 = 0

1/9*f-2 = 0 // + 2

1/9*f = 2 // : 1/9

f = 2/1/9

f = 18

f = 18

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