To simplify the expression \( 7s^2 + 9s^2 + 10s^2 + 6s^2 - 6s^2 \), combine the like terms:
\[ 7s^2 + 9s^2 + 10s^2 + 6s^2 - 6s^2 \]
First, calculate the sum of the positive coefficients:
\[ 7 + 9 + 10 + 6 = 32 \]
Now subtract the coefficient from the subtraction:
\[ 32 - 6 = 26 \]
Thus, the expression simplifies to:
\[ 26s^2 \]
So, the simplified expression is:
\[ \boxed{26s^2} \]