\[\boxed{\text{1070.}\text{\ }еуроки - ответы\ на\ пятёрку}\]
\[\textbf{а)}\ \frac{16 - x}{8} - \frac{18 - x}{12} = 0\ \ \ \ | \cdot 24\]
\[3 \cdot (16 - x) - 2 \cdot (18 - x) = 0\]
\[48 - 3x - 36 + 2x = 0\]
\[- x = - 12\]
\[x = 12\]
\[Ответ:x = 12.\]
\[\textbf{б)}\ \frac{x - 15}{2} - \frac{2x + 1}{8} + 1 = 0\ | \cdot 8\]
\[4 \cdot (x - 15) - (2x + 1) + 8 = 0\]
\[4x - 60 - 2x - 1 + 8 = 0\]
\[2x = 53\]
\[x = 26,5\]
\[Ответ:x = 26,5.\]