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x in (-oo:+oo)
9/8 = x/6 // - x/6
9/8-(x/6) = 0
9/8-1/6*x = 0 // - 9/8
-1/6*x = -9/8 // : -1/6
x = -9/8/(-1/6)
x = 27/4
x = 27/4
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