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t in (-oo:+oo)
5*(3*t-9) = -75 // + 75
5*(3*t-9)+75 = 0
5*(3*t-9)+75 = 0
15*t+30 = 0
15*t+30 = 0
15*t+30 = 0 // - 30
15*t = -30 // : 15
t = -30/15
t = -2
t = -2
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