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