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prettypushkova
а) 5 - (а - 3) = 5 - а + 3 = (5 + 3) - а = 8 - а
б) 7 + (12 - 2b) = 7 + 12 - 2b = 19 - 2b
в) 64 - (14 + 7х) = 64 - 14 - 7х = 50 - 7х
г) 38 + (12р - 8) = 38 + 12р - 8 = (38 - 8) + 12р = 30 + 12р 

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