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t in (-oo:+oo)
7-(6*t) = 28-3*t // - 28-3*t
7-(6*t)-(-3*t)-28 = 0
3*t-6*t-28+7 = 0
-3*t-21 = 0 // + 21
-3*t = 21 // : -3
t = 21/(-3)
t = -7
t = -7
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