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) $\frac{3x + 7}{x - 1}$