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t in (-oo:+oo)
5/7-7*t = 299/7 // - 299/7
5/7-7*t-(299/7) = 0
5/7-7*t-299/7 = 0
-7*t-42 = 0 // + 42
-7*t = 42 // : -7
t = 42/(-7)
t = -6
t = -6
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