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x in (-oo:+oo)
x/10 = 50/20 // - 50/20
x/10-(50/20) = 0
x/10-5/2 = 0
1/10*x-5/2 = 0 // + 5/2
1/10*x = 5/2 // : 1/10
x = 5/2/1/10
x = 25
x = 25
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