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t in (-oo:+oo)
6*(7-2*t) = 30 // - 30
6*(7-2*t)-30 = 0
6*(7-2*t)-30 = 0
12-12*t = 0
12-12*t = 0
12-12*t = 0 // - 12
-12*t = -12 // : -12
t = -12/(-12)
t = 1
t = 1
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