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t in (-oo:+oo)
(1/2)*t+7 = 29/4 // - 29/4
(1/2)*t-(29/4)+7 = 0
(1/2)*t-29/4+7 = 0
1/2*t-1/4 = 0 // + 1/4
1/2*t = 1/4 // : 1/2
t = 1/4/1/2
t = 1/2
t = 1/2
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