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x in (-oo:+oo)
9/8 = x/3 // - x/3
9/8-(x/3) = 0
9/8-1/3*x = 0 // - 9/8
-1/3*x = -9/8 // : -1/3
x = -9/8/(-1/3)
x = 27/8
x = 27/8
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