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x in (-oo:+oo)
(2/3)*x+8 = 11 // - 11
(2/3)*x-11+8 = 0
2/3*x-3 = 0 // + 3
2/3*x = 3 // : 2/3
x = 3/2/3
x = 9/2
x = 9/2
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