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