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t in (-oo:+oo)
4-(2*t) = 6 // - 6
4-(2*t)-6 = 0
4-2*t-6 = 0
-2*t-2 = 0 // + 2
-2*t = 2 // : -2
t = 2/(-2)
t = -1
t = -1
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