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