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x in (-oo:+oo)
(2/3)*x-6 = 7 // - 7
(2/3)*x-7-6 = 0
2/3*x-13 = 0 // + 13
2/3*x = 13 // : 2/3
x = 13/2/3
x = 39/2
x = 39/2
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