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Simplifying -7(3I + 8) = 28 Reorder the terms: -7(8 + 3I) = 28 (8 * -7 + 3I * -7) = 28 (-56 + -21I) = 28 Solving -56 + -21I = 28 Solving for variable 'I'. Move all terms containing I to the left, all other terms to the right. Add '56' to each side of the equation. -56 + 56 + -21I = 28 + 56 Combine like terms: -56 + 56 = 0 0 + -21I = 28 + 56 -21I = 28 + 56 Combine like terms: 28 + 56 = 84 -21I = 84 Divide each side by '-21'. I = -4 Simplifying I = -4
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