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t in (-oo:+oo)
3*(5-7*t) = -6 // + 6
3*(5-7*t)+6 = 0
3*(5-7*t)+6 = 0
21-21*t = 0
21-21*t = 0
21-21*t = 0 // - 21
-21*t = -21 // : -21
t = -21/(-21)
t = 1
t = 1
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