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Simplifying 90 = 7d + -1 Reorder the terms: 90 = -1 + 7d Solving 90 = -1 + 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. 90 + -7d = -1 + 7d + -7d Combine like terms: 7d + -7d = 0 90 + -7d = -1 + 0 90 + -7d = -1 Add '-90' to each side of the equation. 90 + -90 + -7d = -1 + -90 Combine like terms: 90 + -90 = 0 0 + -7d = -1 + -90 -7d = -1 + -90 Combine like terms: -1 + -90 = -91 -7d = -91 Divide each side by '-7'. d = 13 Simplifying d = 13
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