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Simplifying -21d + 15 = -5d + 7 Reorder the terms: 15 + -21d = -5d + 7 Reorder the terms: 15 + -21d = 7 + -5d Solving 15 + -21d = 7 + -5d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '5d' to each side of the equation. 15 + -21d + 5d = 7 + -5d + 5d Combine like terms: -21d + 5d = -16d 15 + -16d = 7 + -5d + 5d Combine like terms: -5d + 5d = 0 15 + -16d = 7 + 0 15 + -16d = 7 Add '-15' to each side of the equation. 15 + -15 + -16d = 7 + -15 Combine like terms: 15 + -15 = 0 0 + -16d = 7 + -15 -16d = 7 + -15 Combine like terms: 7 + -15 = -8 -16d = -8 Divide each side by '-16'. d = 0.5 Simplifying d = 0.5
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