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Simplifying 6d + -3(5 + d) = 21 6d + (5 * -3 + d * -3) = 21 6d + (-15 + -3d) = 21 Reorder the terms: -15 + 6d + -3d = 21 Combine like terms: 6d + -3d = 3d -15 + 3d = 21 Solving -15 + 3d = 21 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 3d = 21 + 15 Combine like terms: -15 + 15 = 0 0 + 3d = 21 + 15 3d = 21 + 15 Combine like terms: 21 + 15 = 36 3d = 36 Divide each side by '3'. d = 12 Simplifying d = 12
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