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x in (-oo:+oo)
x+(2/3)*x = 12 // - 12
x+(2/3)*x-12 = 0
5/3*x-12 = 0 // + 12
5/3*x = 12 // : 5/3
x = 12/5/3
x = 36/5
x = 36/5
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