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żakiet - x+40%*x = x+0,4x = 1,4x
kapelusz - x-20%*x = x-0,2x = 0,8x
x+1,4x+0,8x = 384
3,2x = 384 |:3,2
x = 120
suknia - 120zł
żakiet - 1,4*120zł = 168zł
kapelusz - 0,8*120zł = 96zł