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x in (-oo:+oo)
6/9 = x/30 // - x/30
6/9-(x/30) = 0
2/3-1/30*x = 0 // - 2/3
-1/30*x = -2/3 // : -1/30
x = -2/3/(-1/30)
x = 20
x = 20
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