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x in (-oo:+oo)
x/2-(x/5) = 8 // - 8
x/2-(x/5)-8 = 0
3/10*x-8 = 0 // + 8
3/10*x = 8 // : 3/10
x = 8/3/10
x = 80/3
x = 80/3
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