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x in (-oo:+oo)
9/10 = x/6 // - x/6
9/10-(x/6) = 0
9/10-1/6*x = 0 // - 9/10
-1/6*x = -9/10 // : -1/6
x = -9/10/(-1/6)
x = 27/5
x = 27/5
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