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x in (-oo:+oo)
x/5 = 6/20 // - 6/20
x/5-(6/20) = 0
x/5-3/10 = 0
1/5*x-3/10 = 0 // + 3/10
1/5*x = 3/10 // : 1/5
x = 3/10/1/5
x = 3/2
x = 3/2
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