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t in (-oo:+oo)
(1/2)*t+2/5 = 19/10 // - 19/10
(1/2)*t+2/5-(19/10) = 0
(1/2)*t+2/5-19/10 = 0
1/2*t-3/2 = 0 // + 3/2
1/2*t = 3/2 // : 1/2
t = 3/2/1/2
t = 3
t = 3
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