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t in (-oo:+oo)
1301/441 = (3/7)*t-4*t-(1/9) // - (3/7)*t-4*t-(1/9)
1301/441-(-4*t)-((3/7)*t)+1/9 = 0
4*t+(-3/7)*t+1301/441+1/9 = 0
25/7*t+150/49 = 0 // - 150/49
25/7*t = -150/49 // : 25/7
t = -150/49/25/7
t = -6/7
t = -6/7
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