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t in (-oo:+oo)
t/12 = 900/30 // - 900/30
t/12-(900/30) = 0
t/12-30 = 0
1/12*t-30 = 0 // + 30
1/12*t = 30 // : 1/12
t = 30/1/12
t = 360
t = 360
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