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x in (-oo:+oo)
3*x+x+(2/3)*x = 23 // - 23
3*x+x+(2/3)*x-23 = 0
14/3*x-23 = 0 // + 23
14/3*x = 23 // : 14/3
x = 23/14/3
x = 69/14
x = 69/14
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