Question

(13а+ 7)-(10а-4)=17;

Answer 1

13a+7-10a+4=17
3a+11=17
3a=6
a=2

Answer 2

$(13a+7)-(10a-4)=17$
$13a+7-10a+4=17$
$3a=17-11$
$3a=6$
$a=2$
Ответ: а=2