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x in (-oo:+oo)
x/20 = 4/50 // - 4/50
x/20-(4/50) = 0
x/20-2/25 = 0
1/20*x-2/25 = 0 // + 2/25
1/20*x = 2/25 // : 1/20
x = 2/25/1/20
x = 8/5
x = 8/5
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