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x in (-oo:+oo)
x/2-(x/5) = 20 // - 20
x/2-(x/5)-20 = 0
3/10*x-20 = 0 // + 20
3/10*x = 20 // : 3/10
x = 20/3/10
x = 200/3
x = 200/3
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