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Simplifying 4d + -7 = 21 Reorder the terms: -7 + 4d = 21 Solving -7 + 4d = 21 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 4d = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 4d = 21 + 7 4d = 21 + 7 Combine like terms: 21 + 7 = 28 4d = 28 Divide each side by '4'. d = 7 Simplifying d = 7
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