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Simplifying -7 = d + 21 Reorder the terms: -7 = 21 + d Solving -7 = 21 + d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-1d' to each side of the equation. -7 + -1d = 21 + d + -1d Combine like terms: d + -1d = 0 -7 + -1d = 21 + 0 -7 + -1d = 21 Add '7' to each side of the equation. -7 + 7 + -1d = 21 + 7 Combine like terms: -7 + 7 = 0 0 + -1d = 21 + 7 -1d = 21 + 7 Combine like terms: 21 + 7 = 28 -1d = 28 Divide each side by '-1'. d = -28 Simplifying d = -28
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