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Simplifying -21 = 4.5 + -6i Solving -21 = 4.5 + -6i Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Add '6i' to each side of the equation. -21 + 6i = 4.5 + -6i + 6i Combine like terms: -6i + 6i = 0 -21 + 6i = 4.5 + 0 -21 + 6i = 4.5 Add '21' to each side of the equation. -21 + 21 + 6i = 4.5 + 21 Combine like terms: -21 + 21 = 0 0 + 6i = 4.5 + 21 6i = 4.5 + 21 Combine like terms: 4.5 + 21 = 25.5 6i = 25.5 Divide each side by '6'. i = 4.25 Simplifying i = 4.25
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