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t in (-oo:+oo)
9-t-(4*t) = 59 // - 59
9-t-(4*t)-59 = 0
9-t-4*t-59 = 0
-5*t-50 = 0 // + 50
-5*t = 50 // : -5
t = 50/(-5)
t = -10
t = -10
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