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