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1 188:[248-(974-6xa)+15]x47=564​

Răspuns :

1188:[248-(974-6a)+15]x47=564

1188:[248-(974-6a)+15]=12

12×[248-(974-6a)+15]=1188

248-(974-6a)+15=99

248-(974-6a)=84

84+(974-6a)=248

974-6a=164

6a+164=974

6a=810

a=135