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