3. If the system of equations
$$
\begin{aligned}
& x+5 y+6 z=4 \\
& 2 x+3 y+4 z=7 \\
& x+6 y+a z=b
\end{aligned}
$$
has infinitely many solutions, then the point ( $\mathrm{a}, \mathrm{b}$ ) lies on the line
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