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x in (-oo:+oo)
(5*x)/2 = 500-40 // - 500-40
(5*x)/2-500+40 = 0
5/2*x-460 = 0 // + 460
5/2*x = 460 // : 5/2
x = 460/5/2
x = 184
x = 184
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