137. Реши уравнения: 1) 2,5x−x+3,8x+0,7x=0,54; 2) 3 1/4+1/2y+1 1/3+5/6y=5 11/12.

1. \(2.5x-x+3.8x+0.7x=0.54\)
   \(6x=0.54\)
   \(x=0.09\).
2. \(3\frac14+1\frac13+\left(\frac12+\frac56\right)y=5\frac{11}{12}\)
   \(\frac{43}{12}+\frac43y=\frac{71}{12}\)
   \(\frac43y=\frac{28}{12}=\frac73\)
   \(y=\frac73:\frac43=\frac74\).

Ответ: 1) \(x=0.09\); 2) \(y=\frac74\).