Tìm x, biết: |x|=4/ -3 +7/4

* Hướng dẫn giải

$a\left)\left[\begin{array}{l}x=\frac{5}{12}\\ x=\frac{-5}{12}\end{array}\right.\begin{array}{cccc}& & & \end{array}b\right)\left[\begin{array}{l}x=\frac{89}{14}\\ x=\frac{23}{14}\end{array}\right.$

$c\left)\left[\begin{array}{l}x=\frac{69}{20}\\ x=\frac{-49}{20}\end{array}\right.\begin{array}{cccc}& & & \end{array}d\right)\left[\begin{array}{l}x=\frac{22}{9}\\ x=\frac{-8}{9}\end{array}\right.$