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For i^2 = -1, if 3i (2 + 5i) = x + 6i, then x =?

For i^2 = -1, if 3i (2 + 5i) = x + 6i, then x =?

Explanation

The calculation confirms that:

3i(2 + 5i) = 6i + 15i^2

= 6i - 15

Comparing this to x + 6i:

x = -15