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x in (-oo:+oo)
x/3 = 20/12 // - 20/12
x/3-(20/12) = 0
x/3-5/3 = 0
1/3*x-5/3 = 0 // + 5/3
1/3*x = 5/3 // : 1/3
x = 5/3/1/3
x = 5
x = 5
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