Tìm x, biết: a, -x + 7/4 = 6/5 - 3/4 b, 1-2x= 9/8 + 7/5 : 2/5

b) 1 – 2x = $\frac{9}{8}+\frac{7}{5}:\frac{2}{5}$

1 – 2x = $\frac{9}{8}+\frac{7}{5}.\frac{5}{2}$

1 – 2x = $\frac{9}{8}+\frac{7}{2}$

1 – 2x = $\frac{9}{8}+\frac{28}{8}$

1 – 2x = $\frac{37}{8}$

2x = 1 – $\frac{37}{8}$

2x = $\frac{8}{8}-\frac{37}{8}$

2x = $\frac{-29}{8}$

x = $\frac{-29}{8}$ : 2

x = $\frac{-29}{16}$

Vậy x = $\frac{-29}{16}$