Question

{[(76•a-8):4-96]•3-72}:45

Answer 1

{[(76*a-8):4-96]*3-72}:45=
{[(76a/4-8/4)-96]*3-72}:45=
[(19a-2-96)*3-72]:45=
[(19a-98)*3-72]:45=
(57a-294-72):45=
(57a-366):45=
[3(19a-122)]:45=
(19a-122):15=0
[15(19a-122)]/15=15*0
19a-122=15*0
19a-122=0
19a=122
a=122/19