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Simplifying (7 + -4i) + (-2 + 5i) = 0 Remove parenthesis around (7 + -4i) 7 + -4i + (-2 + 5i) = 0 Remove parenthesis around (-2 + 5i) 7 + -4i + -2 + 5i = 0 Reorder the terms: 7 + -2 + -4i + 5i = 0 Combine like terms: 7 + -2 = 5 5 + -4i + 5i = 0 Combine like terms: -4i + 5i = 1i 5 + 1i = 0 Solving 5 + 1i = 0 Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 1i = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 1i = 0 + -5 1i = 0 + -5 Combine like terms: 0 + -5 = -5 1i = -5 Divide each side by '1'. i = -5 Simplifying i = -5
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