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x in (-oo:+oo)
x/2+x/3 = 4 // - 4
x/2+x/3-4 = 0
5/6*x-4 = 0 // + 4
5/6*x = 4 // : 5/6
x = 4/5/6
x = 24/5
x = 24/5
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