Answer :

[tex] \dfrac{21}{14} = \dfrac{x}{20} [/tex]

Cross-Multiply:
[tex]14x = 21 \times 20[/tex]

Simplify:
[tex]14x = 420[/tex]

Divide both sides by 14:
[tex]x = 30[/tex]

Answer: x = 30

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