Ответ:

  1. \(x=\frac45-\frac23=\frac{12}{15}-\frac{10}{15}=\frac2{15}\).
  2. \(d=5\frac7{12}-1\frac23=\frac{67}{12}-\frac{20}{12}=\frac{47}{12}=3\frac{11}{12}\).

Ответ: 1) \(x=\frac2{15}\); 2) \(d=3\frac{11}{12}\).