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