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t in (-oo:+oo)
t/20 = 900/30 // - 900/30
t/20-(900/30) = 0
t/20-30 = 0
1/20*t-30 = 0 // + 30
1/20*t = 30 // : 1/20
t = 30/1/20
t = 600
t = 600
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