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1, 75 x = 525
x = 300 zł
drugi CD = 075% * 300 = 225 zł
Spr :
225 + 300 = 525 zł
225 = 75% *300 =225
525-x cena drugiego
x= (525-x)* 3/4
x= 525 * 3/4 - x*3/4| +(x * 3/4)
(1,75)x =393,75 |: 1,75
x= 225
525-x= 300