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x in (-oo:+oo)
(2/3)*x-2 = 5 // - 5
(2/3)*x-5-2 = 0
2/3*x-7 = 0 // + 7
2/3*x = 7 // : 2/3
x = 7/2/3
x = 21/2
x = 21/2
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