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t in (-oo:+oo)
-((2/7)*t)-3/7 = -11/42 // + -11/42
-((2/7)*t)-3/7-(-11/42) = 0
(-2/7)*t-3/7+11/42 = 0
-2/7*t-1/6 = 0 // + 1/6
-2/7*t = 1/6 // : -2/7
t = 1/6/(-2/7)
t = -7/12
t = -7/12
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