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Simplifying -5(1 + -3r) = 28 + 4r (1 * -5 + -3r * -5) = 28 + 4r (-5 + 15r) = 28 + 4r Solving -5 + 15r = 28 + 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. -5 + 15r + -4r = 28 + 4r + -4r Combine like terms: 15r + -4r = 11r -5 + 11r = 28 + 4r + -4r Combine like terms: 4r + -4r = 0 -5 + 11r = 28 + 0 -5 + 11r = 28 Add '5' to each side of the equation. -5 + 5 + 11r = 28 + 5 Combine like terms: -5 + 5 = 0 0 + 11r = 28 + 5 11r = 28 + 5 Combine like terms: 28 + 5 = 33 11r = 33 Divide each side by '11'. r = 3 Simplifying r = 3
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