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