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x in (-oo:+oo)
(2/3)*x+(1/6)*x-4 = 11 // - 11
(2/3)*x+(1/6)*x-11-4 = 0
5/6*x-15 = 0 // + 15
5/6*x = 15 // : 5/6
x = 15/5/6
x = 18
x = 18
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