а) 11x = 7x - 122,4
11x - 7x = -122,4
4x = -122,4
x = -122,4 / 4
x = -30,6
Ответ: x = -30,6
б) \(\frac{3}{8}c - \frac{5}{12}c + 1 = \frac{1}{2}c - \frac{1}{12}\)
\(\frac{3}{8}c - \frac{5}{12}c - \frac{1}{2}c = -1 - \frac{1}{12}\)
\(\frac{9}{24}c - \frac{10}{24}c - \frac{12}{24}c = -\frac{12}{12} - \frac{1}{12}\)
\(-\frac{13}{24}c = -\frac{13}{12}\)
\(c = -\frac{13}{12} : -\frac{13}{24}\)
\(c = -\frac{13}{12} \cdot -\frac{24}{13}\)
\(c = 2\)
Ответ: c = 2