x * 3 / x - 3 = 18 / 11
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x * 3 / x - 3 = 18 / 11
3x * 11 = 18 * (x - 3)
33x = 18x - 54
33x - 18x = 15x = -54
x = -54/15 = -18/5 = -3.6
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