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t in (-oo:+oo)
-2183/231 = (-2/7)*t-((1/3)*t)-9 // - (-2/7)*t-((1/3)*t)-9
(1/3)*t-((-2/7)*t)-2183/231+9 = 0
(2/7)*t+(1/3)*t-2183/231+9 = 0
13/21*t-104/231 = 0 // + 104/231
13/21*t = 104/231 // : 13/21
t = 104/231/13/21
t = 8/11
t = 8/11
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