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Simplifying (-7i)(-3i) = 0 Remove parenthesis around (-7i) -7i(-3i) = 0 Remove parenthesis around (-3i) -7i * -3i = 0 Reorder the terms for easier multiplication: -7 * -3i * i = 0 Multiply -7 * -3 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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