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Simplifying 7d + -19 = 20 + 4d Reorder the terms: -19 + 7d = 20 + 4d Solving -19 + 7d = 20 + 4d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-4d' to each side of the equation. -19 + 7d + -4d = 20 + 4d + -4d Combine like terms: 7d + -4d = 3d -19 + 3d = 20 + 4d + -4d Combine like terms: 4d + -4d = 0 -19 + 3d = 20 + 0 -19 + 3d = 20 Add '19' to each side of the equation. -19 + 19 + 3d = 20 + 19 Combine like terms: -19 + 19 = 0 0 + 3d = 20 + 19 3d = 20 + 19 Combine like terms: 20 + 19 = 39 3d = 39 Divide each side by '3'. d = 13 Simplifying d = 13
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