Răspuns :
[(910-23x35):15]+e:80=487
[( 910-805):15]+e:80=487
(105:15)+e:80=487
7+e:80=487
487-7=e:80
480=e:80
e=480:80
e=6
[( 910-805):15]+e:80=487
(105:15)+e:80=487
7+e:80=487
487-7=e:80
480=e:80
e=480:80
e=6
[(910-805):15]e:80=487
(105:15)+e:80=487
7+e:80=487
7+e=487×80
7+e=38.960
e=38.960-7
e=38.953
(105:15)+e:80=487
7+e:80=487
7+e=487×80
7+e=38.960
e=38.960-7
e=38.953