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t in (-oo:+oo)
(1/2)*t+4/7 = 6 // - 6
(1/2)*t+4/7-6 = 0
1/2*t-38/7 = 0 // + 38/7
1/2*t = 38/7 // : 1/2
t = 38/7/1/2
t = 76/7
t = 76/7
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