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t in (-oo:+oo)
3/7-(2*t) = -81/7 // + -81/7
3/7-(2*t)-(-81/7) = 0
3/7-2*t+81/7 = 0
12-2*t = 0 // - 12
-2*t = -12 // : -2
t = -12/(-2)
t = 6
t = 6
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