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D( t )
t+3 = 0
2*t+6 = 0
t = 0
t+3 = 0
t+3 = 0
t+3 = 0 // - 3
t = -3
2*t+6 = 0
2*t+6 = 0
2*t+6 = 0 // - 6
2*t = -6 // : 2
t = -6/2
t = -3
t = 0
t = 0
t in (-oo:-3) U (-3:0) U (0:+oo)
3/(t+3)-(1/t) = 5/(2*t+6) // - 5/(2*t+6)
3/(t+3)-(5/(2*t+6))-(1/t) = 0
3/(t+3)-5*(2*t+6)^-1-t^-1 = 0
3/(t+3)-5/(2*t+6)-1/t = 0
(3*t*(2*t+6))/(t*(t+3)*(2*t+6))+(-5*t*(t+3))/(t*(t+3)*(2*t+6))+(-1*(t+3)*(2*t+6))/(t*(t+3)*(2*t+6)) = 0
3*t*(2*t+6)-5*t*(t+3)-1*(t+3)*(2*t+6) = 0
t^2-2*t^2+3*t-12*t-18 = 0
-t^2-9*t-18 = 0
-t^2-9*t-18 = 0
-1*(t^2+9*t+18) = 0
t^2+9*t+18 = 0
DELTA = 9^2-(1*4*18)
DELTA = 9
DELTA > 0
t = (9^(1/2)-9)/(1*2) or t = (-9^(1/2)-9)/(1*2)
t = -3 or t = -6
-1*(t+6)*(t+3) = 0
(-1*(t+6)*(t+3))/(t*(t+3)*(2*t+6)) = 0
(-1*(t+6)*(t+3))/(t*(t+3)*(2*t+6)) = 0 // * t*(t+3)*(2*t+6)
-1*(t+6)*(t+3) = 0
( t+3 )
t+3 = 0 // - 3
t = -3
( t+6 )
t+6 = 0 // - 6
t = -6
t in { -3}
t = -6
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