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t in (-oo:+oo)
2*(7-4*t) = 78 // - 78
2*(7-4*t)-78 = 0
2*(7-4*t)-78 = 0
-8*t-64 = 0
-8*t-64 = 0
-8*t-64 = 0 // + 64
-8*t = 64 // : -8
t = 64/(-8)
t = -8
t = -8
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