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x in (-oo:+oo)
(2*x)/3 = 20/6 // - 20/6
(2*x)/3-(20/6) = 0
(2*x)/3-10/3 = 0
2/3*x-10/3 = 0 // + 10/3
2/3*x = 10/3 // : 2/3
x = 10/3/2/3
x = 5
x = 5
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