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Simplifying -4 + 6 + -1d = 21 Combine like terms: -4 + 6 = 2 2 + -1d = 21 Solving 2 + -1d = 21 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -1d = 21 + -2 Combine like terms: 2 + -2 = 0 0 + -1d = 21 + -2 -1d = 21 + -2 Combine like terms: 21 + -2 = 19 -1d = 19 Divide each side by '-1'. d = -19 Simplifying d = -19
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