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t in (-oo:+oo)
68 = 5-6*t-(3*t) // - 5-6*t-(3*t)
3*t-(-6*t)-5+68 = 0
6*t+3*t-5+68 = 0
9*t+63 = 0 // - 63
9*t = -63 // : 9
t = -63/9
t = -7
t = -7
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