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t in (-oo:+oo)
(1/2)*t-(1/7) = 6/7 // - 6/7
(1/2)*t-(1/7)-(6/7) = 0
(1/2)*t-1/7-6/7 = 0
1/2*t-1 = 0 // + 1
1/2*t = 1 // : 1/2
t = 1/1/2
t = 2
t = 2
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