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t in (-oo:+oo)
(1/2)*t-4/7 = -2*t-(179/7) // + -2*t-(179/7)
(1/2)*t-(-2*t)-4/7+179/7 = 0
(1/2)*t+2*t-4/7+179/7 = 0
5/2*t+25 = 0 // - 25
5/2*t = -25 // : 5/2
t = -25/5/2
t = -10
t = -10
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