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t in (-oo:+oo)
5*(1*t+9) = 100 // - 100
5*(1*t+9)-100 = 0
5*(t+9)-100 = 0
5*(t+9)-100 = 0
5*t-55 = 0
5*t-55 = 0
5*t-55 = 0 // + 55
5*t = 55 // : 5
t = 55/5
t = 11
t = 11
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