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x in (-oo:+oo)
(2/3)*x-(8/3) = 7 // - 7
(2/3)*x-(8/3)-7 = 0
(2/3)*x-8/3-7 = 0
2/3*x-29/3 = 0 // + 29/3
2/3*x = 29/3 // : 2/3
x = 29/3/2/3
x = 29/2
x = 29/2
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