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x in (-oo:+oo)
20/12 = x/8 // - x/8
20/12-(x/8) = 0
5/3-1/8*x = 0 // - 5/3
-1/8*x = -5/3 // : -1/8
x = -5/3/(-1/8)
x = 40/3
x = 40/3
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