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x in (-oo:+oo)
(2/3)*x = 20/3 // - 20/3
(2/3)*x-(20/3) = 0
(2/3)*x-20/3 = 0
2/3*x-20/3 = 0 // + 20/3
2/3*x = 20/3 // : 2/3
x = 20/3/2/3
x = 10
x = 10
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