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x in (-oo:+oo)
x/10 = 4/8 // - 4/8
x/10-(4/8) = 0
x/10-1/2 = 0
1/10*x-1/2 = 0 // + 1/2
1/10*x = 1/2 // : 1/10
x = 1/2/1/10
x = 5
x = 5
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