y-3/y=7-3/7

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Solution for y-3/y=7-3/7 equation: 


D( y )

y = 0

y = 0

y = 0

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

y-(3/y) = 7-(3/7) // - 7-(3/7)

y-(3/y)+3/7-7 = 0

y-3*y^-1+3/7-7 = 0

1*y^1-3*y^-1-46/7*y^0 = 0

(1*y^2-46/7*y^1-3*y^0)/(y^1) = 0 // * y^2

y^1*(1*y^2-46/7*y^1-3*y^0) = 0

y^1

y^2+(-46/7)*y-3 = 0

y^2+(-46/7)*y-3 = 0

DELTA = (-46/7)^2-(-3*1*4)

DELTA = 2704/49

DELTA > 0

y = ((2704/49)^(1/2)-(-46/7))/(1*2) or y = (-(-46/7)-(2704/49)^(1/2))/(1*2)

y = 7 or y = -3/7

y in { -3/7, 7} 

y in { -3/7, 7 }

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