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t in (-oo:+oo)
2/7-((2/7)*t) = -20/7 // + -20/7
2/7-((2/7)*t)-(-20/7) = 0
(-2/7)*t+2/7+20/7 = 0
22/7-2/7*t = 0 // - 22/7
-2/7*t = -22/7 // : -2/7
t = -22/7/(-2/7)
t = 11
t = 11
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