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t in (-oo:+oo)
(-3/4)*t = 9/10 // - 9/10
(-3/4)*t-(9/10) = 0
(-3/4)*t-9/10 = 0
-3/4*t-9/10 = 0 // + 9/10
-3/4*t = 9/10 // : -3/4
t = 9/10/(-3/4)
t = -6/5
t = -6/5
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