\[ 34 - 47a - 35a - 51b - 73b \]
\[ = 34 + (-47a - 35a) + (-51b - 73b) \]
\[ = 34 - 82a - 124b \]
\[ (27p + 74q) - (21q + 27p) \]
\[ = 27p + 74q - 21q - 27p \]
\[ = (27p - 27p) + (74q - 21q) \]
\[ = 0 + 53q \]
\[ = 53q \]
Ответ: а) 34 - 82a - 124b; б) 53q