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t in (-oo:+oo)
(-2/7)*t+1/5 = -3/35 // + -3/35
(-2/7)*t+1/5-(-3/35) = 0
(-2/7)*t+1/5+3/35 = 0
2/7-2/7*t = 0 // - 2/7
-2/7*t = -2/7 // : -2/7
t = -2/7/(-2/7)
t = 1
t = 1
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