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x in (-oo:+oo)
(10200*x)/1000 = 500 // - 500
(10200*x)/1000-500 = 0
51/5*x-500 = 0 // + 500
51/5*x = 500 // : 51/5
x = 500/51/5
x = 2500/51
x = 2500/51
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