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t in (-oo:+oo)
(-5/7)*t+2/7 = -23/7 // + -23/7
(-5/7)*t+2/7-(-23/7) = 0
(-5/7)*t+2/7+23/7 = 0
25/7-5/7*t = 0 // - 25/7
-5/7*t = -25/7 // : -5/7
t = -25/7/(-5/7)
t = 5
t = 5
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