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t in (-oo:+oo)
(3/4)*t = 6/20 // - 6/20
(3/4)*t-(6/20) = 0
(3/4)*t-3/10 = 0
3/4*t-3/10 = 0 // + 3/10
3/4*t = 3/10 // : 3/4
t = 3/10/3/4
t = 2/5
t = 2/5
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