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q in (-oo:+oo)
(1/6)*q+2/3 = (5/6)*q+1/3 // - (5/6)*q+1/3
(1/6)*q-((5/6)*q)+2/3-(1/3) = 0
(1/6)*q+(-5/6)*q+2/3-1/3 = 0
1/3-2/3*q = 0 // - 1/3
-2/3*q = -1/3 // : -2/3
q = -1/3/(-2/3)
q = 1/2
q = 1/2
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