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t in (-oo:+oo)
(1/5)*t+3/4 = 43/20 // - 43/20
(1/5)*t+3/4-(43/20) = 0
(1/5)*t+3/4-43/20 = 0
1/5*t-7/5 = 0 // + 7/5
1/5*t = 7/5 // : 1/5
t = 7/5/1/5
t = 7
t = 7
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