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x in (-oo:+oo)
23/8 = (-1/2)*x // - (-1/2)*x
23/8-((-1/2)*x) = 0
(1/2)*x+23/8 = 0
1/2*x+23/8 = 0 // - 23/8
1/2*x = -23/8 // : 1/2
x = -23/8/1/2
x = -23/4
x = -23/4
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