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Simplifying -21 = -39 + -1d Solving -21 = -39 + -1d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add 'd' to each side of the equation. -21 + d = -39 + -1d + d Combine like terms: -1d + d = 0 -21 + d = -39 + 0 -21 + d = -39 Add '21' to each side of the equation. -21 + 21 + d = -39 + 21 Combine like terms: -21 + 21 = 0 0 + d = -39 + 21 d = -39 + 21 Combine like terms: -39 + 21 = -18 d = -18 Simplifying d = -18
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