Which of these shows a pair of equivalent expressions?
\(21n-7(n)\) ; \(2n\cdot7\)
\(\dfrac{2}{3}t+\dfrac{5t}{9}\) ; \(\dfrac{4t}{9}+\dfrac{5t}{9}\)
\(10 \text{% of }\) x ; \(\dfrac{x}{0.10}\)
\(10y\) ; \(\dfrac{11y+9y}{10}\)
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