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x in (-oo:+oo)
(2/3)*x+2 = 7 // - 7
(2/3)*x-7+2 = 0
2/3*x-5 = 0 // + 5
2/3*x = 5 // : 2/3
x = 5/2/3
x = 15/2
x = 15/2
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