Question

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

Answer 1

{[(41+362:2)-32•6+a]•221:13}-140:5=
{[(41+181)-32•6+a]•221:13}-140:5=
[(222-32•6+a)•221:13]-140:5=
[(190•6+a)•221:13]-140:5=
[(1140+a)•221:13]-140:5=
[(1140+a)•17]-140:5=
(1140+a)•17-28=
(1140+a)•11=
1140+a=635-11
1140+a=624
a=1140-624
a=516