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Simplifying -3(r + -5) = 28 Reorder the terms: -3(-5 + r) = 28 (-5 * -3 + r * -3) = 28 (15 + -3r) = 28 Solving 15 + -3r = 28 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -3r = 28 + -15 Combine like terms: 15 + -15 = 0 0 + -3r = 28 + -15 -3r = 28 + -15 Combine like terms: 28 + -15 = 13 -3r = 13 Divide each side by '-3'. r = -4.333333333 Simplifying r = -4.333333333
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