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x in (-oo:+oo)
x/5 = 4/10 // - 4/10
x/5-(4/10) = 0
x/5-2/5 = 0
1/5*x-2/5 = 0 // + 2/5
1/5*x = 2/5 // : 1/5
x = 2/5/1/5
x = 2
x = 2
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