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t in (-oo:+oo)
(1/5)*t+6 = 121/20 // - 121/20
(1/5)*t-(121/20)+6 = 0
(1/5)*t-121/20+6 = 0
1/5*t-1/20 = 0 // + 1/20
1/5*t = 1/20 // : 1/5
t = 1/20/1/5
t = 1/4
t = 1/4
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