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