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