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Simplifying -12 = 3(7 + -1d) -12 = (7 * 3 + -1d * 3) -12 = (21 + -3d) Solving -12 = 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. -12 + 3d = 21 + -3d + 3d Combine like terms: -3d + 3d = 0 -12 + 3d = 21 + 0 -12 + 3d = 21 Add '12' to each side of the equation. -12 + 12 + 3d = 21 + 12 Combine like terms: -12 + 12 = 0 0 + 3d = 21 + 12 3d = 21 + 12 Combine like terms: 21 + 12 = 33 3d = 33 Divide each side by '3'. d = 11 Simplifying d = 11
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