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t in (-oo:+oo)
(-4/7)*t = 2/3 // - 2/3
(-4/7)*t-(2/3) = 0
(-4/7)*t-2/3 = 0
-4/7*t-2/3 = 0 // + 2/3
-4/7*t = 2/3 // : -4/7
t = 2/3/(-4/7)
t = -7/6
t = -7/6
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