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x in (-oo:+oo)
40/6 = x/20 // - x/20
40/6-(x/20) = 0
20/3-1/20*x = 0 // - 20/3
-1/20*x = -20/3 // : -1/20
x = -20/3/(-1/20)
x = 400/3
x = 400/3
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