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x in (-oo:+oo)
x+x+x/2+10 = 3000 // - 3000
x+x+x/2-3000+10 = 0
5/2*x-2990 = 0 // + 2990
5/2*x = 2990 // : 5/2
x = 2990/5/2
x = 1196
x = 1196
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