Answer
$27$
Work Step by Step
The order of operations follow the PEMDAS rule.
First Priority: P -Parentheses
Second Priority: E - exponents
Third Priority: M/D - Multiplication or division, whichever comes first from the left
Fourth Priority: A/S - Addition or subtraction, whichever comes first from the left
Apply the exponent to obtain:
$=7-4 \cdot 5 \div (-1)$
Perform multiplication next to obtain:
$=7-20 \div (-1)$
Divide to obtain:
$=7 -(-20)$
Subtract to obtain:
$=7 + 20
\\=27$
