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Simplifying -21 = -3d + -4d Combine like terms: -3d + -4d = -7d -21 = -7d Solving -21 = -7d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '7d' to each side of the equation. -21 + 7d = -7d + 7d Combine like terms: -7d + 7d = 0 -21 + 7d = 0 Add '21' to each side of the equation. -21 + 21 + 7d = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 7d = 0 + 21 7d = 0 + 21 Combine like terms: 0 + 21 = 21 7d = 21 Divide each side by '7'. d = 3 Simplifying d = 3
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