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t in (-oo:+oo)
2*t+6 = 78-7*t // - 78-7*t
2*t-(-7*t)-78+6 = 0
2*t+7*t-78+6 = 0
9*t-72 = 0 // + 72
9*t = 72 // : 9
t = 72/9
t = 8
t = 8
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