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Simplifying 28 = -7(9 + de) 28 = (9 * -7 + de * -7) 28 = (-63 + -7de) Solving 28 = -63 + -7de Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '7de' to each side of the equation. 28 + 7de = -63 + -7de + 7de Combine like terms: -7de + 7de = 0 28 + 7de = -63 + 0 28 + 7de = -63 Add '-28' to each side of the equation. 28 + -28 + 7de = -63 + -28 Combine like terms: 28 + -28 = 0 0 + 7de = -63 + -28 7de = -63 + -28 Combine like terms: -63 + -28 = -91 7de = -91 Divide each side by '7e'. d = -13e-1 Simplifying d = -13e-1
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