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Simplifying 9 = 7(d + 4) Reorder the terms: 9 = 7(4 + d) 9 = (4 * 7 + d * 7) 9 = (28 + 7d) Solving 9 = 28 + 7d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-7d' to each side of the equation. 9 + -7d = 28 + 7d + -7d Combine like terms: 7d + -7d = 0 9 + -7d = 28 + 0 9 + -7d = 28 Add '-9' to each side of the equation. 9 + -9 + -7d = 28 + -9 Combine like terms: 9 + -9 = 0 0 + -7d = 28 + -9 -7d = 28 + -9 Combine like terms: 28 + -9 = 19 -7d = 19 Divide each side by '-7'. d = -2.714285714 Simplifying d = -2.714285714
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