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x in (-oo:+oo)
(2/3)*x-18 = 25 // - 25
(2/3)*x-25-18 = 0
2/3*x-43 = 0 // + 43
2/3*x = 43 // : 2/3
x = 43/2/3
x = 129/2
x = 129/2
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