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t in (-oo:+oo)
(-4/7)*t+(1/2)*t+2 = 71/35 // - 71/35
(-4/7)*t+(1/2)*t-(71/35)+2 = 0
(-4/7)*t+(1/2)*t-71/35+2 = 0
-1/14*t-1/35 = 0 // + 1/35
-1/14*t = 1/35 // : -1/14
t = 1/35/(-1/14)
t = -2/5
t = -2/5
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