Tìm x, biết: a) x + 7,25 = 15,75

a) x + 7,25 = 15,75

x = 15,75 – 7,25

x = 8,5

Vậy x = 8,5.

b) $\left(-\frac{1}{3}\right)-x=\frac{17}{6}$

$x=\left(-\frac{1}{3}\right)-\frac{17}{6}$

$x=\frac{-2}{6}-\frac{17}{6}$

$x=\frac{-19}{6}$

Vậy $x=\frac{-19}{6}$