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(4*x)/5-((8*((4*x)/5))/100)+500 = 0
(4*x)/5+(-8/125)*x+500 = 0
92/125*x+500 = 0 // - 500
92/125*x = -500 // : 92/125
x = -500/92/125
x = -15625/23
x = -15625/23
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