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t in (-oo:+oo)
67 = 1-7*t-(4*t) // - 1-7*t-(4*t)
4*t-(-7*t)-1+67 = 0
7*t+4*t-1+67 = 0
11*t+66 = 0 // - 66
11*t = -66 // : 11
t = -66/11
t = -6
t = -6
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