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x in (-oo:+oo)
x+18 = 6-(x/3) // - 6-(x/3)
x+x/3-6+18 = 0
4/3*x+12 = 0 // - 12
4/3*x = -12 // : 4/3
x = -12/4/3
x = -9
x = -9
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