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t in (-oo:+oo)
(5/7)*t-2 = -136/63 // + -136/63
(5/7)*t-(-136/63)-2 = 0
(5/7)*t+136/63-2 = 0
5/7*t+10/63 = 0 // - 10/63
5/7*t = -10/63 // : 5/7
t = -10/63/5/7
t = -2/9
t = -2/9
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