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Simplifying 3d + 21 = 7 + -4a Reorder the terms: 21 + 3d = 7 + -4a Solving 21 + 3d = 7 + -4a Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 3d = 7 + -21 + -4a Combine like terms: 21 + -21 = 0 0 + 3d = 7 + -21 + -4a 3d = 7 + -21 + -4a Combine like terms: 7 + -21 = -14 3d = -14 + -4a Divide each side by '3'. d = -4.666666667 + -1.333333333a Simplifying d = -4.666666667 + -1.333333333a
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