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t in (-oo:+oo)
9 = (3/7)*t // - (3/7)*t
9-((3/7)*t) = 0
(-3/7)*t+9 = 0
9-3/7*t = 0 // - 9
-3/7*t = -9 // : -3/7
t = -9/(-3/7)
t = 21
t = 21
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