CIMC 2023 Part A - Question 2, CEMC UWaterloo

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This problem is tagged with cimc, cimc23, highschool.

(Canadian Intermediate Mathematics Contest 2023, Part A, Question 2, CEMC - UWaterloo)

A new mathematical operation, $\blacklozenge$, is defined by $a \blacklozenge b = \frac{2a}{b}$.
For example, $6 \blacklozenge 3 = \frac{2 \times 6}{3} = 4$. If $a \blacklozenge 4 = 18$, what is the value of $a$?

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