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t in (-oo:+oo)
-2 = 7-4*t-(5*t) // - 7-4*t-(5*t)
5*t-(-4*t)-7-2 = 0
4*t+5*t-7-2 = 0
9*t-9 = 0 // + 9
9*t = 9 // : 9
t = 9/9
t = 1
t = 1
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