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t in (-oo:+oo)
t/20 = 100/10 // - 100/10
t/20-(100/10) = 0
t/20-10 = 0
1/20*t-10 = 0 // + 10
1/20*t = 10 // : 1/20
t = 10/1/20
t = 200
t = 200
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