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t in (-oo:+oo)
-10 = 4*t-5*t+2 // - 4*t-5*t+2
-(-5*t)-(4*t)-10-2 = 0
5*t-4*t-10-2 = 0
t-12 = 0 // + 12
t = 12
t = 12
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