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x in (-oo:+oo)
9/27 = x/30 // - x/30
9/27-(x/30) = 0
1/3-1/30*x = 0 // - 1/3
-1/30*x = -1/3 // : -1/30
x = -1/3/(-1/30)
x = 10
x = 10
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