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