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t in (-oo:+oo)
122/21 = (6/7)*t-6*t+2/3 // - (6/7)*t-6*t+2/3
122/21-(-6*t)-((6/7)*t)-(2/3) = 0
6*t+(-6/7)*t+122/21-2/3 = 0
36/7*t+36/7 = 0 // - 36/7
36/7*t = -36/7 // : 36/7
t = -36/7/36/7
t = -1
t = -1
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