Answer
$3$
Work Step by Step
The order of operations follow the following hierarchy (PEMDAS rule):
(i) Parentheses/grouping symbols
(ii) Exponents
(iii) Multiplication/Division, whichever comes first from the left
(iv) Addition/Subtraction, whichever comes first from the left
Use the rule above to obtain:
$=30 \div [25 \div (-5)]+9
\\=30 \div (-5) +9
\\=(-6)+9
\\=3$
