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x in (-oo:+oo)
x/3+x/2+x/4 = 18 // - 18
x/3+x/2+x/4-18 = 0
13/12*x-18 = 0 // + 18
13/12*x = 18 // : 13/12
x = 18/13/12
x = 216/13
x = 216/13
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