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x in (-oo:+oo)
x+x/2 = 1800 // - 1800
x+x/2-1800 = 0
3/2*x-1800 = 0 // + 1800
3/2*x = 1800 // : 3/2
x = 1800/3/2
x = 1200
x = 1200
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