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Simplifying -5 + -1d = 3(7 + -1d) -5 + -1d = (7 * 3 + -1d * 3) -5 + -1d = (21 + -3d) Solving -5 + -1d = 21 + -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. -5 + -1d + 3d = 21 + -3d + 3d Combine like terms: -1d + 3d = 2d -5 + 2d = 21 + -3d + 3d Combine like terms: -3d + 3d = 0 -5 + 2d = 21 + 0 -5 + 2d = 21 Add '5' to each side of the equation. -5 + 5 + 2d = 21 + 5 Combine like terms: -5 + 5 = 0 0 + 2d = 21 + 5 2d = 21 + 5 Combine like terms: 21 + 5 = 26 2d = 26 Divide each side by '2'. d = 13 Simplifying d = 13
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