To evaluate the expression \( b - 2a - c \) for \( a = -7 \), \( b = 3 \), and \( c = -7 \), we can substitute the values of \( a \), \( b \), and \( c \) into the expression:
\[ b - 2a - c = 3 - 2(-7) - (-7) \]
Next, simplify the expression step by step:
-
Calculate \( -2(-7) \): \[ -2(-7) = 14 \]
-
Substitute back into the expression: \[ 3 + 14 + 7 \]
-
Now add the values: \[ 3 + 14 = 17 \] \[ 17 + 7 = 24 \]
Thus, the value of \( b - 2a - c \) is \( \boxed{24} \).