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x in (-oo:+oo)
x/10 = 8/20 // - 8/20
x/10-(8/20) = 0
x/10-2/5 = 0
1/10*x-2/5 = 0 // + 2/5
1/10*x = 2/5 // : 1/10
x = 2/5/1/10
x = 4
x = 4
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