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Simplifying 3(d + 2) + -7 = 21 Reorder the terms: 3(2 + d) + -7 = 21 (2 * 3 + d * 3) + -7 = 21 (6 + 3d) + -7 = 21 Reorder the terms: 6 + -7 + 3d = 21 Combine like terms: 6 + -7 = -1 -1 + 3d = 21 Solving -1 + 3d = 21 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 3d = 21 + 1 Combine like terms: -1 + 1 = 0 0 + 3d = 21 + 1 3d = 21 + 1 Combine like terms: 21 + 1 = 22 3d = 22 Divide each side by '3'. d = 7.333333333 Simplifying d = 7.333333333
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