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t in (-oo:+oo)
(3*t)/4+(7*t)/2 = 20 // - 20
(3*t)/4+(7*t)/2-20 = 0
17/4*t-20 = 0 // + 20
17/4*t = 20 // : 17/4
t = 20/17/4
t = 80/17
t = 80/17
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