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t in (-oo:+oo)
(3/16)*t-(1/4) = 1/28 // - 1/28
(3/16)*t-(1/4)-(1/28) = 0
(3/16)*t-1/4-1/28 = 0
3/16*t-2/7 = 0 // + 2/7
3/16*t = 2/7 // : 3/16
t = 2/7/3/16
t = 32/21
t = 32/21
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