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x in (-oo:+oo)
-28 = (-7/4)*x // - (-7/4)*x
-((-7/4)*x)-28 = 0
(7/4)*x-28 = 0
7/4*x-28 = 0 // + 28
7/4*x = 28 // : 7/4
x = 28/7/4
x = 16
x = 16
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