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t in (-oo:+oo)
54 = 12*(3/4)*t // - 12*(3/4)*t
54-(12*(3/4)*t) = 0
54-9*t = 0
54-9*t = 0 // - 54
-9*t = -54 // : -9
t = -54/(-9)
t = 6
t = 6
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