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x in (-oo:+oo)
(7*x)/2 = 1/4 // - 1/4
(7*x)/2-(1/4) = 0
(7*x)/2-1/4 = 0
7/2*x-1/4 = 0 // + 1/4
7/2*x = 1/4 // : 7/2
x = 1/4/7/2
x = 1/14
x = 1/14
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