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Simplifying 7d + -7 = 0 Reorder the terms: -7 + 7d = 0 Solving -7 + 7d = 0 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 7d = 0 + 7 Combine like terms: -7 + 7 = 0 0 + 7d = 0 + 7 7d = 0 + 7 Combine like terms: 0 + 7 = 7 7d = 7 Divide each side by '7'. d = 1 Simplifying d = 1
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