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x in (-oo:+oo)
14 = (-7/4)*x // - (-7/4)*x
14-((-7/4)*x) = 0
(7/4)*x+14 = 0
7/4*x+14 = 0 // - 14
7/4*x = -14 // : 7/4
x = -14/7/4
x = -8
x = -8
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