Tìm x

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**Đề bài tìm x:**

1. Tìm x, biết:
a) \(-2,5x + 4 = \frac{97}{21} \Rightarrow x = -1,5\)

b) \(-\frac{3}{5} - (x - 1,2) = -\frac{12}{25}\)

c) \(\frac{x - 5}{12} = \frac{9}{6} \Rightarrow x = \frac{6}{23}\)

d) \(\frac{4}{5} + 7 + x = 6\)

e) \(-\frac{3}{2} + x = 4 \cdot \frac{2}{3}\)

f) \(\frac{8}{2} - \frac{3}{3} = 1\)

g) \(\frac{7}{12} - (x + \frac{7}{10}) = \frac{5}{4}\)

2. Tìm x, biết:
a) \(\frac{1}{2}x + 4 - (x + 2) = \frac{3}{4}\)

b) \(18 - \frac{18}{3} - (1,73x - 3,27x) = \frac{74}{4}\)

c) \(|x| + \frac{1}{2}x = 2\)

d) \(\frac{2}{5} - x + 2x = \frac{3}{4}\)

e) \(\frac{1}{3}(x - 2) - \frac{3}{7} + \frac{4}{5} = \frac{1}{2} - \frac{7}{10}\)

f) \(x + 5 = -10\)

g) \(\frac{2}{5} - \frac{7}{9} \cdot x = \frac{1}{2}\)

h) \(\frac{1}{2}x - 1 - \frac{1}{3} = -\frac{3}{2} - 1\)

i) \(-5(x + 4) - \frac{1}{2}(x - 2) = -\frac{3}{2}x - \frac{5}{6}\)

j) \(3(x - \frac{1}{2}) - 5(x - \frac{3}{5}) = -x + 5\)

3. Tìm x, y thuộc Z, biết:
a) \(\frac{5}{x} + \frac{y}{6} = \frac{1}{6} (x + 0)\)

b) \(\frac{3}{x} = \frac{11}{55} \Rightarrow x = -\frac{27}{45}\)

c) \(\frac{2}{15} = \frac{y + 12}{25} = \frac{240}{300}\)

d) \(x - 2 = -\frac{1}{y}\)

4. Tìm r thuộc Z do các phép sau có GNT:

a) \(-\frac{3}{x - 1}\)

b) \(\frac{2}{x}\)

c) \(\frac{x + 5}{x - 2}\)

d) \(\frac{3x + 7}{x - 1}\)