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t in (-oo:+oo)
1/2-5*t = (-2/5)*t-(9/5) // - (-2/5)*t-(9/5)
1/2-5*t-((-2/5)*t)+9/5 = 0
(2/5)*t-5*t+1/2+9/5 = 0
23/10-23/5*t = 0 // - 23/10
-23/5*t = -23/10 // : -23/5
t = -23/10/(-23/5)
t = 1/2
t = 1/2
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