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Simplifying 9 = -4(r + -5) + 11 Reorder the terms: 9 = -4(-5 + r) + 11 9 = (-5 * -4 + r * -4) + 11 9 = (20 + -4r) + 11 Reorder the terms: 9 = 20 + 11 + -4r Combine like terms: 20 + 11 = 31 9 = 31 + -4r Solving 9 = 31 + -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. 9 + 4r = 31 + -4r + 4r Combine like terms: -4r + 4r = 0 9 + 4r = 31 + 0 9 + 4r = 31 Add '-9' to each side of the equation. 9 + -9 + 4r = 31 + -9 Combine like terms: 9 + -9 = 0 0 + 4r = 31 + -9 4r = 31 + -9 Combine like terms: 31 + -9 = 22 4r = 22 Divide each side by '4'. r = 5.5 Simplifying r = 5.5
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