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Simplifying 7d + -4 = 3d + 12 Reorder the terms: -4 + 7d = 3d + 12 Reorder the terms: -4 + 7d = 12 + 3d Solving -4 + 7d = 12 + 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. -4 + 7d + -3d = 12 + 3d + -3d Combine like terms: 7d + -3d = 4d -4 + 4d = 12 + 3d + -3d Combine like terms: 3d + -3d = 0 -4 + 4d = 12 + 0 -4 + 4d = 12 Add '4' to each side of the equation. -4 + 4 + 4d = 12 + 4 Combine like terms: -4 + 4 = 0 0 + 4d = 12 + 4 4d = 12 + 4 Combine like terms: 12 + 4 = 16 4d = 16 Divide each side by '4'. d = 4 Simplifying d = 4
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