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x in (-oo:+oo)
x/20 = 10/50 // - 10/50
x/20-(10/50) = 0
x/20-1/5 = 0
1/20*x-1/5 = 0 // + 1/5
1/20*x = 1/5 // : 1/20
x = 1/5/1/20
x = 4
x = 4
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