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t in (-oo:+oo)
4*t+(2/7)*t+2/7 = -11/14 // + -11/14
4*t+(2/7)*t+2/7-(-11/14) = 0
4*t+(2/7)*t+2/7+11/14 = 0
30/7*t+15/14 = 0 // - 15/14
30/7*t = -15/14 // : 30/7
t = -15/14/30/7
t = -1/4
t = -1/4
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