\(\frac{3}{7}-x=\frac{1}{4}-\left(-\frac{3}{5}\right)\)
\(\frac{3}{7}-x=\frac{1}{4}+\frac{3}{5}\)
\(\frac{3}{7}-x=\frac{17}{20}\)
\(x=\frac{3}{7}-\frac{17}{20}\)
\(x=\frac{-59}{140}\)
\(\frac{3}{7}-x=\frac{1}{4}-\left(-\frac{3}{5}\right)\)
\(\Leftrightarrow\frac{3}{7}-x=\frac{1}{4}+\frac{3}{5}\)
\(\Leftrightarrow\frac{3}{7}-x=\frac{17}{20}\)
\(\Leftrightarrow x=\frac{3}{7}-\frac{17}{20}\)
\(\Leftrightarrow x=\frac{11}{140}\)
3/7-x=1/4-[1/4-(-3/5)]
3/7-x=1/4-[1/4+3/5]
3/7-x=1/4-17/20
3/7-x=3/5
x=3/7-3/5
x=-6/35
Vậy x=-6/35
