\(\dfrac{x}{3}=\dfrac{2}{3}+-\dfrac{1}{7}\)
\(\Rightarrow\dfrac{x}{3}=\dfrac{2\cdot7+\left(-1\right)\cdot3}{21}\)
\(\Rightarrow\dfrac{x}{3}=\dfrac{11}{21}\)
\(\Rightarrow x=\dfrac{33}{21}\)
\(\dfrac{x}{3}=\dfrac{2}{3}+\dfrac{-1}{7}\)
\(\dfrac{x}{3}=\dfrac{14}{21}+\dfrac{-3}{21}\)
\(\dfrac{x}{3}=\dfrac{11}{21}\)
x.11= 21.3
x.11= 63
x = 63/11
Vậy x= 63/11
\(\dfrac{x}{3}=\dfrac{2}{3}+\dfrac{-1}{7}\)
\(\dfrac{x}{3}=\dfrac{11}{21} \)
\(x=\dfrac{3.11}{21}\)
➩\(x=\dfrac{11}{7}\)