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t in (-oo:+oo)
(2/5)*t-t = (3/2)*t+3 // - (3/2)*t+3
(2/5)*t-t-((3/2)*t)-3 = 0
(2/5)*t-t+(-3/2)*t-3 = 0
-21/10*t-3 = 0 // + 3
-21/10*t = 3 // : -21/10
t = 3/(-21/10)
t = -10/7
t = -10/7
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