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t in (-oo:+oo)
t/4 = 9/3 // - 9/3
t/4-(9/3) = 0
t/4-3 = 0
1/4*t-3 = 0 // + 3
1/4*t = 3 // : 1/4
t = 3/1/4
t = 12
t = 12
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