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t in (-oo:+oo)
t/4 = 100/10 // - 100/10
t/4-(100/10) = 0
t/4-10 = 0
1/4*t-10 = 0 // + 10
1/4*t = 10 // : 1/4
t = 10/1/4
t = 40
t = 40
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