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x in (-oo:+oo)
5/30 = x/20 // - x/20
5/30-(x/20) = 0
1/6-1/20*x = 0 // - 1/6
-1/20*x = -1/6 // : -1/20
x = -1/6/(-1/20)
x = 10/3
x = 10/3
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