7=v-18/v

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Solution for 7=v-18/v equation: 


D( v )

v = 0

v = 0

v = 0

v in (-oo:0) U (0:+oo)

7 = v-(18/v) // - v-(18/v)

18/v-v+7 = 0

18*v^-1-1*v^1+7*v^0 = 0

(7*v^1-1*v^2+18*v^0)/(v^1) = 0 // * v^2

v^1*(7*v^1-1*v^2+18*v^0) = 0

v^1

7*v-v^2+18 = 0

7*v-v^2+18 = 0

DELTA = 7^2-(-1*4*18)

DELTA = 121

DELTA > 0

v = (121^(1/2)-7)/(-1*2) or v = (-121^(1/2)-7)/(-1*2)

v = -2 or v = 9

v in { -2, 9} 

v in { -2, 9 }

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