-f/2=-9

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Solution for -f/2=-9 equation: 


f in (-oo:+oo)

-f/2 = -9 // + 9

9-f/2 = 0

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

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

f = -9/(-1/2)

f = 18

f = 18

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