-2 add 5 multiply by 7?
What order of operations?
If you were saying -2, adding [5 multiplied by 7], then the answer is 33. If you were saying -2, adding 5, then multiplying by 7, the answer is 21.
-2.
add 5 -> 3
multiply by 7 -> 21
add (5 multiply by 7) -> -2 add 35 -> 33
+425 
