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185000 = 210000*(1-(x/25)) // - 210000*(1-(x/25))
185000-(210000*(1-(x/25))) = 0
185000-210000*(1-(x/25)) = 0
185000-210000*(1-1/25*x) = 0
185000-210000*(1-1/25*x) = 0
8400*x-25000 = 0
8400*x-25000 = 0
8400*x-25000 = 0 // + 25000
8400*x = 25000 // : 8400
x = 25000/8400
x = 125/42
x = 125/42
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