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x in (-oo:+oo)
x/2-(9/10) = x/5 // - x/5
x/2-(x/5)-(9/10) = 0
x/2-(x/5)-9/10 = 0
3/10*x-9/10 = 0 // + 9/10
3/10*x = 9/10 // : 3/10
x = 9/10/3/10
x = 3
x = 3
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