А) 10a+b-10b-a=9a-9b= 9(a-b)
Г) 23x-23+4a+4x=27x+4a-23
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А) 10a+b-10b-a=9a-9b= 9(a-b)
Г) 23x-23+4a+4x=27x+4a-23