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Simplifying 18 = -10 + -7d Solving 18 = -10 + -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. 18 + 7d = -10 + -7d + 7d Combine like terms: -7d + 7d = 0 18 + 7d = -10 + 0 18 + 7d = -10 Add '-18' to each side of the equation. 18 + -18 + 7d = -10 + -18 Combine like terms: 18 + -18 = 0 0 + 7d = -10 + -18 7d = -10 + -18 Combine like terms: -10 + -18 = -28 7d = -28 Divide each side by '7'. d = -4 Simplifying d = -4
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