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x in (-oo:+oo)
(-1/2)*x = 5/16 // - 5/16
(-1/2)*x-(5/16) = 0
(-1/2)*x-5/16 = 0
-1/2*x-5/16 = 0 // + 5/16
-1/2*x = 5/16 // : -1/2
x = 5/16/(-1/2)
x = -5/8
x = -5/8
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