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Simplifying 128 = 4(8 + 8r) 128 = (8 * 4 + 8r * 4) 128 = (32 + 32r) Solving 128 = 32 + 32r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-32r' to each side of the equation. 128 + -32r = 32 + 32r + -32r Combine like terms: 32r + -32r = 0 128 + -32r = 32 + 0 128 + -32r = 32 Add '-128' to each side of the equation. 128 + -128 + -32r = 32 + -128 Combine like terms: 128 + -128 = 0 0 + -32r = 32 + -128 -32r = 32 + -128 Combine like terms: 32 + -128 = -96 -32r = -96 Divide each side by '-32'. r = 3 Simplifying r = 3
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