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Simplifying 15 + d = 3d Solving 15 + d = 3d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-3d' to each side of the equation. 15 + d + -3d = 3d + -3d Combine like terms: d + -3d = -2d 15 + -2d = 3d + -3d Combine like terms: 3d + -3d = 0 15 + -2d = 0 Add '-15' to each side of the equation. 15 + -15 + -2d = 0 + -15 Combine like terms: 15 + -15 = 0 0 + -2d = 0 + -15 -2d = 0 + -15 Combine like terms: 0 + -15 = -15 -2d = -15 Divide each side by '-2'. d = 7.5 Simplifying d = 7.5
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