Some use BODMAS, but a more correct way is:
First brackets within brackets, then brackets, then
exponents, then
Multiplication and division
then addition and subtraction.
When dealing with equal precedence (multiplication and division have equal precedence and also addition and subtraction have equal precedence) read from left to right.
(41 - 15divided by5) - (48divided by 12)
=(41-3) - 4
=38 - 4 =34