The answer to each of the following questions is a single digit integer, ranging from 0 to 9. C...

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The answer to each of the following questions is a single digit integer, ranging from 0 to 9.

Colemanite is an important mineral of boron. It is represented as \( \mathrm{Ca}_{2} \mathrm{~B}_{x} \mathrm{O}_{11} \cdot 5 \mathrm{H}_{2} \mathrm{O} \). What is the value of \( x \) ?
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