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x in (-oo:+oo)
x+(12*x)/100 = 500 // - 500
x+(12*x)/100-500 = 0
28/25*x-500 = 0 // + 500
28/25*x = 500 // : 28/25
x = 500/28/25
x = 3125/7
x = 3125/7
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