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t in (-oo:+oo)
4-(7*t) = 11 // - 11
4-(7*t)-11 = 0
4-7*t-11 = 0
-7*t-7 = 0 // + 7
-7*t = 7 // : -7
t = 7/(-7)
t = -1
t = -1
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