f) \(\dfrac{-x}{3}=2\dfrac{1}{7}\div\dfrac{5}{7}\)
\(\dfrac{-x}{3}=\dfrac{15}{7}\div\dfrac{5}{7}\)
\(\dfrac{-x}{3}=3\)
\(-x=3\cdot3\)
\(-x=9\)
\(x=-9\)
g) \(\dfrac{5}{4}+\dfrac{1}{4}\div x=1\dfrac{3}{8}\)
\(\dfrac{5}{4}+\dfrac{1}{4}\div x=\dfrac{11}{8}\)
\(\dfrac{1}{4}\div x=\dfrac{11}{8}-\dfrac{5}{4}\)
\(\dfrac{1}{4}\div x=\dfrac{1}{8}\)
\(x=\dfrac{1}{4}\div\dfrac{1}{8}\)
\(x=2\)
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