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x in (-oo:+oo)
(2/3)*x-24 = (-1/3)*x-3 // - (-1/3)*x-3
(2/3)*x-((-1/3)*x)-24+3 = 0
(2/3)*x+(1/3)*x-24+3 = 0
x-21 = 0 // + 21
x = 21
x = 21
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