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t in (-oo:+oo)
(-5/7)*t-(7*t)+1/3 = -161/3 // + -161/3
(-5/7)*t-(7*t)+1/3-(-161/3) = 0
(-5/7)*t-7*t+1/3+161/3 = 0
54-54/7*t = 0 // - 54
-54/7*t = -54 // : -54/7
t = -54/(-54/7)
t = 7
t = 7
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