Question

Which operation should be performed first in the expression 5+7÷7×4−17?

Answer 1

First division, then multiplication, addition and at last subtraction.

According to BODMAS (it varies in different countries) rule.

Answer 2

Multiplication and division have the same precedence, binding tighter than addition and subtraction. Among operators with the same precedence we go left to right.

So the first operation to do is division. ÷

PEDMAS notwithstanding if your expression depends on the details of the left to right rules, you're better off adding parenthesis to make things clearer.