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Simplifying -7 = 7d + -21 Reorder the terms: -7 = -21 + 7d Solving -7 = -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. -7 + -7d = -21 + 7d + -7d Combine like terms: 7d + -7d = 0 -7 + -7d = -21 + 0 -7 + -7d = -21 Add '7' to each side of the equation. -7 + 7 + -7d = -21 + 7 Combine like terms: -7 + 7 = 0 0 + -7d = -21 + 7 -7d = -21 + 7 Combine like terms: -21 + 7 = -14 -7d = -14 Divide each side by '-7'. d = 2 Simplifying d = 2
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