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t in (-oo:+oo)
(1/2)*t+3/2 = (-2/5)*t+5/4 // - (-2/5)*t+5/4
(1/2)*t-((-2/5)*t)+3/2-(5/4) = 0
(1/2)*t+(2/5)*t+3/2-5/4 = 0
9/10*t+1/4 = 0 // - 1/4
9/10*t = -1/4 // : 9/10
t = -1/4/9/10
t = -5/18
t = -5/18
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