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Simplifying (7 + -3i) + (-8 + -9i) = 0 Remove parenthesis around (7 + -3i) 7 + -3i + (-8 + -9i) = 0 Remove parenthesis around (-8 + -9i) 7 + -3i + -8 + -9i = 0 Reorder the terms: 7 + -8 + -3i + -9i = 0 Combine like terms: 7 + -8 = -1 -1 + -3i + -9i = 0 Combine like terms: -3i + -9i = -12i -1 + -12i = 0 Solving -1 + -12i = 0 Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -12i = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -12i = 0 + 1 -12i = 0 + 1 Combine like terms: 0 + 1 = 1 -12i = 1 Divide each side by '-12'. i = -0.08333333333 Simplifying i = -0.08333333333
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