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Simplifying 7i + -1(2 + 2i) + 20 = 0 7i + (2 * -1 + 2i * -1) + 20 = 0 7i + (-2 + -2i) + 20 = 0 Reorder the terms: -2 + 20 + 7i + -2i = 0 Combine like terms: -2 + 20 = 18 18 + 7i + -2i = 0 Combine like terms: 7i + -2i = 5i 18 + 5i = 0 Solving 18 + 5i = 0 Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 5i = 0 + -18 Combine like terms: 18 + -18 = 0 0 + 5i = 0 + -18 5i = 0 + -18 Combine like terms: 0 + -18 = -18 5i = -18 Divide each side by '5'. i = -3.6 Simplifying i = -3.6
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