Level:
Project ID:
1003159004
Accepted:
1
Clonable:
0
Easy:
0
Which of the given numbers is the sum of all the solutions of the equations \( \text{(1)} \) and \( \text{(2)} \)?
\[ \begin{aligned} 10^{x-1}&=2 &\text{(1)} \\
2^{1-x}&=5^x &\text{(2)} \end{aligned} \]
\( \log40 \)
\( \log22 \)
\( \log12+\log_72 \)
\( \log12-\log_72 \)