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x in (-oo:+oo)
(-31/2)*x = 3 // - 3
(-31/2)*x-3 = 0
-31/2*x-3 = 0 // + 3
-31/2*x = 3 // : -31/2
x = 3/(-31/2)
x = -6/31
x = -6/31
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