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x in (-oo:+oo)
(2/3)*x-28 = 9 // - 9
(2/3)*x-28-9 = 0
2/3*x-37 = 0 // + 37
2/3*x = 37 // : 2/3
x = 37/2/3
x = 111/2
x = 111/2
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