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