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t in (-oo:+oo)
t/50 = 6/20 // - 6/20
t/50-(6/20) = 0
t/50-3/10 = 0
1/50*t-3/10 = 0 // + 3/10
1/50*t = 3/10 // : 1/50
t = 3/10/1/50
t = 15
t = 15
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