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2009:[(13×a+47)×3-10=7​

Răspuns :

Răspuns:

2009:[(13×a+47)×3-10]=7

[(13xa+47)X3-10]=2009:7

(13xa+47)x3-10=287

(13xa+47)X3=287+10

(13xa+47)X3=297

(13xa+47)=297:3

13xa+47=99

13xa=99-47

13xa=52

a=52:13

a=4