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Simplifying -5(r + -4) = 28 + -1r Reorder the terms: -5(-4 + r) = 28 + -1r (-4 * -5 + r * -5) = 28 + -1r (20 + -5r) = 28 + -1r Solving 20 + -5r = 28 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. 20 + -5r + r = 28 + -1r + r Combine like terms: -5r + r = -4r 20 + -4r = 28 + -1r + r Combine like terms: -1r + r = 0 20 + -4r = 28 + 0 20 + -4r = 28 Add '-20' to each side of the equation. 20 + -20 + -4r = 28 + -20 Combine like terms: 20 + -20 = 0 0 + -4r = 28 + -20 -4r = 28 + -20 Combine like terms: 28 + -20 = 8 -4r = 8 Divide each side by '-4'. r = -2 Simplifying r = -2
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