Ответ:
2a-(7+5a)=0
2a-7-5a=0
-3a-7=0
-3a= 7
a= -7/3= -2 ⅓
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Ответ:
2a-(7+5a)=0
2a-7-5a=0
-3a-7=0
-3a= 7
a= -7/3= -2 ⅓