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q in (-oo:+oo)
19/3 = (4/3)*(1-2*q)+(29*q)/3 // - (4/3)*(1-2*q)+(29*q)/3
19/3-((4/3)*(1-2*q))-((29*q)/3) = 0
(-4/3)*(1-2*q)+(-29/3)*q+19/3 = 0
(-29*q)/3-4/3*(1-2*q)+19/3 = 0
(-4/3*3*(1-2*q))/3+(-29*q)/3+19/3 = 0
19-4/3*3*(1-2*q)-29*q = 0
19-21*q-4 = 0
15-21*q = 0
(15-21*q)/3 = 0
(15-21*q)/3 = 0 // * 3
15-21*q = 0
15-21*q = 0 // - 15
-21*q = -15 // : -21
q = -15/(-21)
q = 5/7
q = 5/7
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