Tìm giá trị của x: 4x - 3/5 = 7/2

Bài 2:

a) 4x - 3/5 = 7/2

4x = 7/2 + 3/5

4x = 41/10

x = 41/10 : 4

x = 41/40

2b) 4/7 - 3x = 5/3

3x = 4/7 - 5/3

3x = -23/21

x = - 23/21 : 3

x = - 23/63

2c) \(3\frac{1}{3}+\frac{5}{4}x=3\frac{1}{2}\)

\(\frac{10}{3}+\frac{5}{4}x=\frac{7}{2}\)

\(\frac{5}{4}x=\frac{7}{2}-\frac{10}{3}\)

\(\frac{5}{4}x=\frac{1}{6}\)

\(x=\frac{1}{6}:\frac{5}{4}\)

\(x\ =\ \frac{2}{15}\)