Giải giúp mik vs ạ . Lưu ý dùng quy tắc chuyển vế

a)$\dfrac{7}{4}$ - x = $\dfrac{6}{5}$ - $\dfrac{3}{4}$

$\dfrac{7}{4}$ - x = $\dfrac{6}{5}$ + (-$\dfrac{3}{4}$)

$\dfrac{7}{4}$ - x = $\dfrac{9}{20}$

x = $\dfrac{7}{4}$ - $\dfrac{9}{20}$

x = $\dfrac{13}{10}$

Vậy: x = $\dfrac{13}{10}$

b)$\dfrac{3}{4}$ - 6x = $\dfrac{7}{13}$

6x = $\dfrac{3}{4}$ - $\dfrac{7}{13}$

6x = $\dfrac{11}{52}$

x = $\dfrac{11}{52}$ : 6

x = $\dfrac{11}{312}$

Vậy: x = $\dfrac{11}{312}$

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