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Simplifying 51.20 = 128 + -1r * 128 Reorder the terms for easier multiplication: 51.20 = 128 + -1 * 128r Multiply -1 * 128 51.20 = 128 + -128r Solving 51.20 = 128 + -128r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '128r' to each side of the equation. 51.20 + 128r = 128 + -128r + 128r Combine like terms: -128r + 128r = 0 51.20 + 128r = 128 + 0 51.20 + 128r = 128 Add '-51.20' to each side of the equation. 51.20 + -51.20 + 128r = 128 + -51.20 Combine like terms: 51.20 + -51.20 = 0.00 0.00 + 128r = 128 + -51.20 128r = 128 + -51.20 Combine like terms: 128 + -51.20 = 76.8 128r = 76.8 Divide each side by '128'. r = 0.6 Simplifying r = 0.6
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