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t in (-oo:+oo)
(-2/7)*t = -16/7 // + -16/7
(-2/7)*t-(-16/7) = 0
(-2/7)*t+16/7 = 0
16/7-2/7*t = 0 // - 16/7
-2/7*t = -16/7 // : -2/7
t = -16/7/(-2/7)
t = 8
t = 8
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