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Simplifying d + 7 = 3d + 15 Reorder the terms: 7 + d = 3d + 15 Reorder the terms: 7 + d = 15 + 3d Solving 7 + d = 15 + 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. 7 + d + -3d = 15 + 3d + -3d Combine like terms: d + -3d = -2d 7 + -2d = 15 + 3d + -3d Combine like terms: 3d + -3d = 0 7 + -2d = 15 + 0 7 + -2d = 15 Add '-7' to each side of the equation. 7 + -7 + -2d = 15 + -7 Combine like terms: 7 + -7 = 0 0 + -2d = 15 + -7 -2d = 15 + -7 Combine like terms: 15 + -7 = 8 -2d = 8 Divide each side by '-2'. d = -4 Simplifying d = -4
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