Question

{[(205:5+362:2)-32×6+a]×221:13}-140:5=635

Answer 1

{[(41+181)-192+a]*17}-28=635
[(222-192+a)*17]-28=635
[(30+a)*17]-28=635
30*17+17*a-28=635
510+a*17-28=635
a*17=635-510+28
a*17=153
a=153:17
a=9

Answer 2

{[(41+181)-192+a]x17}-28=635 (222-192+a)x17=635+28 (30+a)x17=663 30+a=663/17 30+a=39 a=39-30 a=9