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t in (-oo:+oo)
31/2 = 6*t+(1/2)*t+9 // - 6*t+(1/2)*t+9
31/2-(6*t)-((1/2)*t)-9 = 0
(-1/2)*t-6*t+31/2-9 = 0
13/2-13/2*t = 0 // - 13/2
-13/2*t = -13/2 // : -13/2
t = -13/2/(-13/2)
t = 1
t = 1
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