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t in (-oo:+oo)
(1/2)*t+10/7 = 7 // - 7
(1/2)*t+10/7-7 = 0
1/2*t-39/7 = 0 // + 39/7
1/2*t = 39/7 // : 1/2
t = 39/7/1/2
t = 78/7
t = 78/7
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