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Simplifying 128 = -5r + 8(2r + 5) Reorder the terms: 128 = -5r + 8(5 + 2r) 128 = -5r + (5 * 8 + 2r * 8) 128 = -5r + (40 + 16r) Reorder the terms: 128 = 40 + -5r + 16r Combine like terms: -5r + 16r = 11r 128 = 40 + 11r Solving 128 = 40 + 11r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-11r' to each side of the equation. 128 + -11r = 40 + 11r + -11r Combine like terms: 11r + -11r = 0 128 + -11r = 40 + 0 128 + -11r = 40 Add '-128' to each side of the equation. 128 + -128 + -11r = 40 + -128 Combine like terms: 128 + -128 = 0 0 + -11r = 40 + -128 -11r = 40 + -128 Combine like terms: 40 + -128 = -88 -11r = -88 Divide each side by '-11'. r = 8 Simplifying r = 8
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