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Simplifying 90 = 70d + -1 Reorder the terms: 90 = -1 + 70d Solving 90 = -1 + 70d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-70d' to each side of the equation. 90 + -70d = -1 + 70d + -70d Combine like terms: 70d + -70d = 0 90 + -70d = -1 + 0 90 + -70d = -1 Add '-90' to each side of the equation. 90 + -90 + -70d = -1 + -90 Combine like terms: 90 + -90 = 0 0 + -70d = -1 + -90 -70d = -1 + -90 Combine like terms: -1 + -90 = -91 -70d = -91 Divide each side by '-70'. d = 1.3 Simplifying d = 1.3
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