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t in (-oo:+oo)
5*(6-3*t) = -60 // + 60
5*(6-3*t)+60 = 0
5*(6-3*t)+60 = 0
90-15*t = 0
90-15*t = 0
90-15*t = 0 // - 90
-15*t = -90 // : -15
t = -90/(-15)
t = 6
t = 6
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