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t in (-oo:+oo)
(-3/4)*t = 7/8 // - 7/8
(-3/4)*t-(7/8) = 0
(-3/4)*t-7/8 = 0
-3/4*t-7/8 = 0 // + 7/8
-3/4*t = 7/8 // : -3/4
t = 7/8/(-3/4)
t = -7/6
t = -7/6
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