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Simplifying 81x2 + -81r + 64 = 0 Reorder the terms: 64 + -81r + 81x2 = 0 Solving 64 + -81r + 81x2 = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-64' to each side of the equation. 64 + -81r + -64 + 81x2 = 0 + -64 Reorder the terms: 64 + -64 + -81r + 81x2 = 0 + -64 Combine like terms: 64 + -64 = 0 0 + -81r + 81x2 = 0 + -64 -81r + 81x2 = 0 + -64 Combine like terms: 0 + -64 = -64 -81r + 81x2 = -64 Add '-81x2' to each side of the equation. -81r + 81x2 + -81x2 = -64 + -81x2 Combine like terms: 81x2 + -81x2 = 0 -81r + 0 = -64 + -81x2 -81r = -64 + -81x2 Divide each side by '-81'. r = 0.7901234568 + x2 Simplifying r = 0.7901234568 + x2
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