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Simplifying 15 = 7 + 2d Solving 15 = 7 + 2d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-2d' to each side of the equation. 15 + -2d = 7 + 2d + -2d Combine like terms: 2d + -2d = 0 15 + -2d = 7 + 0 15 + -2d = 7 Add '-15' to each side of the equation. 15 + -15 + -2d = 7 + -15 Combine like terms: 15 + -15 = 0 0 + -2d = 7 + -15 -2d = 7 + -15 Combine like terms: 7 + -15 = -8 -2d = -8 Divide each side by '-2'. d = 4 Simplifying d = 4
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