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x in (-oo:+oo)
(1/2)*x-400 = 500 // - 500
(1/2)*x-500-400 = 0
1/2*x-900 = 0 // + 900
1/2*x = 900 // : 1/2
x = 900/1/2
x = 1800
x = 1800
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