решите уровнение у+12/6=26,299/25-z=13
У +12/6 = 26 у + 2 = 26 у = 26 - 2 у = 24 --------------------------- 299 / (25 - z) = 13 13( 25 - z) = 299 325 - 13z = 299 13z = 325 - 299 13z = 26 z = 2