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t in (-oo:+oo)
-((2/5)*t)-3/4 = 13/4 // - 13/4
-((2/5)*t)-3/4-(13/4) = 0
(-2/5)*t-3/4-13/4 = 0
-2/5*t-4 = 0 // + 4
-2/5*t = 4 // : -2/5
t = 4/(-2/5)
t = -10
t = -10
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