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x in (-oo:+oo)
20/8 = x/6 // - x/6
20/8-(x/6) = 0
5/2-1/6*x = 0 // - 5/2
-1/6*x = -5/2 // : -1/6
x = -5/2/(-1/6)
x = 15
x = 15
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