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Simplifying 78 = -3d + 90 Reorder the terms: 78 = 90 + -3d Solving 78 = 90 + -3d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '3d' to each side of the equation. 78 + 3d = 90 + -3d + 3d Combine like terms: -3d + 3d = 0 78 + 3d = 90 + 0 78 + 3d = 90 Add '-78' to each side of the equation. 78 + -78 + 3d = 90 + -78 Combine like terms: 78 + -78 = 0 0 + 3d = 90 + -78 3d = 90 + -78 Combine like terms: 90 + -78 = 12 3d = 12 Divide each side by '3'. d = 4 Simplifying d = 4
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