ж) 3x-2x-1= 7 1 1 3 3-x-x = 15 2 15 2

ж) $$3\frac{7}{15}x - \left(2\frac{1}{2}x - 1\frac{3}{15}x\right) = 3\frac{7}{15}x - 2\frac{1}{2}x + 1\frac{3}{15}x = 3\frac{14}{30}x - 2\frac{15}{30}x + 1\frac{6}{30}x = (3-2+1 + \frac{14-15+6}{30})x = 2\frac{5}{30}x = 2\frac{1}{6}x$$

Ответ: $$2\frac{1}{6}x$$