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Simplifying
3i(7i) = 0
Remove parenthesis around (7i)
3i * 7i = 0
Reorder the terms for easier multiplication:
3 * 7i * i = 0
Multiply 3 * 7
21i * i = 0
Multiply i * i
21i2 = 0
Solving
21i2 = 0
Solving for variable 'i'.
Move all terms containing i to the left, all other terms to the right.
Divide each side by '21'.
i2 = 0
Simplifying
i2 = 0
Take the square root of each side:
i = {0}
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