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Simplifying -4(r + -5) = 28 + -1r Reorder the terms: -4(-5 + r) = 28 + -1r (-5 * -4 + r * -4) = 28 + -1r (20 + -4r) = 28 + -1r Solving 20 + -4r = 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 + -4r + r = 28 + -1r + r Combine like terms: -4r + r = -3r 20 + -3r = 28 + -1r + r Combine like terms: -1r + r = 0 20 + -3r = 28 + 0 20 + -3r = 28 Add '-20' to each side of the equation. 20 + -20 + -3r = 28 + -20 Combine like terms: 20 + -20 = 0 0 + -3r = 28 + -20 -3r = 28 + -20 Combine like terms: 28 + -20 = 8 -3r = 8 Divide each side by '-3'. r = -2.666666667 Simplifying r = -2.666666667
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