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Simplifying ad2 + -90d + 81 = 25d2 + 81 Reorder the terms: 81 + ad2 + -90d = 25d2 + 81 Reorder the terms: 81 + ad2 + -90d = 81 + 25d2 Add '-81' to each side of the equation. 81 + ad2 + -81 + -90d = 81 + -81 + 25d2 Reorder the terms: 81 + -81 + ad2 + -90d = 81 + -81 + 25d2 Combine like terms: 81 + -81 = 0 0 + ad2 + -90d = 81 + -81 + 25d2 ad2 + -90d = 81 + -81 + 25d2 Combine like terms: 81 + -81 = 0 ad2 + -90d = 0 + 25d2 ad2 + -90d = 25d2 Solving ad2 + -90d = 25d2 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '90d' to each side of the equation. ad2 + -90d + 90d = 90d + 25d2 Combine like terms: -90d + 90d = 0 ad2 + 0 = 90d + 25d2 ad2 = 90d + 25d2 Divide each side by 'd2'. a = 90d-1 + 25 Simplifying a = 90d-1 + 25 Reorder the terms: a = 25 + 90d-1
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