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x in (-oo:+oo)
4/6 = x/20 // - x/20
4/6-(x/20) = 0
2/3-1/20*x = 0 // - 2/3
-1/20*x = -2/3 // : -1/20
x = -2/3/(-1/20)
x = 40/3
x = 40/3
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