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