Let's solve the expression step by step.
First, calculate the value inside the parentheses:
\[ 3.2 - 5.1 = -1.9 \]
Now, substitute that back into the original subtraction:
\[ 7.9 - (-1.9) \]
Subtracting a negative value is the same as adding the positive value:
\[ 7.9 + 1.9 = 9.8 \]
Thus, the result of the subtraction \( 7.9 - (3.2 - 5.1) \) is:
\[ \boxed{9.8} \]
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