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t in (-oo:+oo)
(5/4)*t+1/4 = (-1/7)*t+1/7 // - (-1/7)*t+1/7
(5/4)*t-((-1/7)*t)+1/4-(1/7) = 0
(5/4)*t+(1/7)*t+1/4-1/7 = 0
39/28*t+3/28 = 0 // - 3/28
39/28*t = -3/28 // : 39/28
t = -3/28/39/28
t = -1/13
t = -1/13
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