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t in (-oo:+oo)
(4/7)*t = -20/63 // + -20/63
(4/7)*t-(-20/63) = 0
(4/7)*t+20/63 = 0
4/7*t+20/63 = 0 // - 20/63
4/7*t = -20/63 // : 4/7
t = -20/63/4/7
t = -5/9
t = -5/9
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