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Simplifying 7d + 4d + -7d + -4d + 2d + -2 = 16 Reorder the terms: -2 + 7d + 4d + -7d + -4d + 2d = 16 Combine like terms: 7d + 4d = 11d -2 + 11d + -7d + -4d + 2d = 16 Combine like terms: 11d + -7d = 4d -2 + 4d + -4d + 2d = 16 Combine like terms: 4d + -4d = 0 -2 + 0 + 2d = 16 -2 + 2d = 16 Solving -2 + 2d = 16 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + 2d = 16 + 2 Combine like terms: -2 + 2 = 0 0 + 2d = 16 + 2 2d = 16 + 2 Combine like terms: 16 + 2 = 18 2d = 18 Divide each side by '2'. d = 9 Simplifying d = 9
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