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Simplifying (9 + 4i) + -1(-4 + i) = 0 Remove parenthesis around (9 + 4i) 9 + 4i + -1(-4 + i) = 0 9 + 4i + (-4 * -1 + i * -1) = 0 9 + 4i + (4 + -1i) = 0 Reorder the terms: 9 + 4 + 4i + -1i = 0 Combine like terms: 9 + 4 = 13 13 + 4i + -1i = 0 Combine like terms: 4i + -1i = 3i 13 + 3i = 0 Solving 13 + 3i = 0 Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 3i = 0 + -13 Combine like terms: 13 + -13 = 0 0 + 3i = 0 + -13 3i = 0 + -13 Combine like terms: 0 + -13 = -13 3i = -13 Divide each side by '3'. i = -4.333333333 Simplifying i = -4.333333333
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