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Simplifying (D + 4)(d + -7) = 0 Reorder the terms: (4 + D)(d + -7) = 0 Reorder the terms: (4 + D)(-7 + d) = 0 Multiply (4 + D) * (-7 + d) (4(-7 + d) + D(-7 + d)) = 0 ((-7 * 4 + d * 4) + D(-7 + d)) = 0 ((-28 + 4d) + D(-7 + d)) = 0 (-28 + 4d + (-7 * D + d * D)) = 0 (-28 + 4d + (-7D + dD)) = 0 Reorder the terms: (-28 + -7D + 4d + dD) = 0 (-28 + -7D + 4d + dD) = 0 Solving -28 + -7D + 4d + dD = 0 Solving for variable 'D'. Move all terms containing D to the left, all other terms to the right. Add '28' to each side of the equation. -28 + -7D + 4d + 28 + dD = 0 + 28 Reorder the terms: -28 + 28 + -7D + 4d + dD = 0 + 28 Combine like terms: -28 + 28 = 0 0 + -7D + 4d + dD = 0 + 28 -7D + 4d + dD = 0 + 28 Combine like terms: 0 + 28 = 28 -7D + 4d + dD = 28 Add '-4d' to each side of the equation. -7D + 4d + -4d + dD = 28 + -4d Combine like terms: 4d + -4d = 0 -7D + 0 + dD = 28 + -4d -7D + dD = 28 + -4d Reorder the terms: -28 + -7D + 4d + dD = 28 + -4d + -28 + 4d Reorder the terms: -28 + -7D + 4d + dD = 28 + -28 + -4d + 4d Combine like terms: 28 + -28 = 0 -28 + -7D + 4d + dD = 0 + -4d + 4d -28 + -7D + 4d + dD = -4d + 4d Combine like terms: -4d + 4d = 0 -28 + -7D + 4d + dD = 0 The solution to this equation could not be determined.
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