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x in (-oo:+oo)
(2/3)*x = x-20 // - x-20
(2/3)*x-x+20 = 0
20-1/3*x = 0 // - 20
-1/3*x = -20 // : -1/3
x = -20/(-1/3)
x = 60
x = 60
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