\[29(a - 3) + 71(a + 2) =\]
\[= 29a - 87 + 71a + 142 =\]
\[= 100a + 55;\]
\[a = 5,973:\]
\[100 \cdot 5,973 + 55 =\]
\[= 597,3 + 55 = 652,3.\]