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x in (-oo:+oo)
9/4 = 3*x // - 3*x
9/4-(3*x) = 0
9/4-3*x = 0
9/4-3*x = 0 // - 9/4
-3*x = -9/4 // : -3
x = -9/4/(-3)
x = 3/4
x = 3/4
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