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Simplifying 21 + -2d = 7 Solving 21 + -2d = 7 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 + -2d = 7 + -21 Combine like terms: 21 + -21 = 0 0 + -2d = 7 + -21 -2d = 7 + -21 Combine like terms: 7 + -21 = -14 -2d = -14 Divide each side by '-2'. d = 7 Simplifying d = 7
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