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t in (-oo:+oo)
5*(1*t+8) = 30 // - 30
5*(1*t+8)-30 = 0
5*(t+8)-30 = 0
5*(t+8)-30 = 0
5*t+10 = 0
5*t+10 = 0
5*t+10 = 0 // - 10
5*t = -10 // : 5
t = -10/5
t = -2
t = -2
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