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t in (-oo:+oo)
(-7/2)*t = -4 // + 4
(-7/2)*t+4 = 0
4-7/2*t = 0 // - 4
-7/2*t = -4 // : -7/2
t = -4/(-7/2)
t = 8/7
t = 8/7
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