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t in (-oo:+oo)
3-((2/5)*t) = 4 // - 4
3-((2/5)*t)-4 = 0
(-2/5)*t-4+3 = 0
-2/5*t-1 = 0 // + 1
-2/5*t = 1 // : -2/5
t = 1/(-2/5)
t = -5/2
t = -5/2
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