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t in (-oo:+oo)
(1/5)*t-6 = -209/35 // + -209/35
(1/5)*t-(-209/35)-6 = 0
(1/5)*t+209/35-6 = 0
1/5*t-1/35 = 0 // + 1/35
1/5*t = 1/35 // : 1/5
t = 1/35/1/5
t = 1/7
t = 1/7
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