Ответ:

  1. \(153-2x=148\);
    \(-2x=-5\);
    \(x=2,5\).
  2. \(\frac{5x}{4}=80\);
    \(5x=320\);
    \(x=64\).
  3. \(5\frac{1}{2}x-2\frac{3}{4}=6\frac{7}{8}\);
    \(\frac{11}{2}x=\frac{55}{8}+\frac{22}{8}=\frac{77}{8}\);
    \(x=\frac{77}{8}\cdot\frac{2}{11}=\frac{7}{4}=1\frac{3}{4}\).
  4. \(0,4x=10,2-5,4=4,8\);
    \(x=12\).
  5. \(5x+0,04=1\);
    \(5x=0,96\);
    \(x=0,192\).
  6. \(\frac{4,5}{2x}=0,3\);
    \(4,5=0,6x\);
    \(x=7,5\).
  7. \(\frac{0,16}{0,5x}=0,08\);
    \(0,16=0,04x\);
    \(x=4\).

Ответ: 1) \(x=2,5\); 2) \(x=64\); 3) \(x=1\frac{3}{4}\); 4) \(x=12\); 5) \(x=0,192\); 6) \(x=7,5\); 7) \(x=4\).