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Simplifying 12d + 15 = 7d Reorder the terms: 15 + 12d = 7d Solving 15 + 12d = 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. 15 + 12d + -7d = 7d + -7d Combine like terms: 12d + -7d = 5d 15 + 5d = 7d + -7d Combine like terms: 7d + -7d = 0 15 + 5d = 0 Add '-15' to each side of the equation. 15 + -15 + 5d = 0 + -15 Combine like terms: 15 + -15 = 0 0 + 5d = 0 + -15 5d = 0 + -15 Combine like terms: 0 + -15 = -15 5d = -15 Divide each side by '5'. d = -3 Simplifying d = -3
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