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Simplifying -54 = 7d + -9 Reorder the terms: -54 = -9 + 7d Solving -54 = -9 + 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. -54 + -7d = -9 + 7d + -7d Combine like terms: 7d + -7d = 0 -54 + -7d = -9 + 0 -54 + -7d = -9 Add '54' to each side of the equation. -54 + 54 + -7d = -9 + 54 Combine like terms: -54 + 54 = 0 0 + -7d = -9 + 54 -7d = -9 + 54 Combine like terms: -9 + 54 = 45 -7d = 45 Divide each side by '-7'. d = -6.428571429 Simplifying d = -6.428571429
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