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x in (-oo:+oo)
(-1/2)*x = 3/8 // - 3/8
(-1/2)*x-(3/8) = 0
(-1/2)*x-3/8 = 0
-1/2*x-3/8 = 0 // + 3/8
-1/2*x = 3/8 // : -1/2
x = 3/8/(-1/2)
x = -3/4
x = -3/4
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