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Simplifying -9r + 8 + -6r = 28 Reorder the terms: 8 + -9r + -6r = 28 Combine like terms: -9r + -6r = -15r 8 + -15r = 28 Solving 8 + -15r = 28 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -15r = 28 + -8 Combine like terms: 8 + -8 = 0 0 + -15r = 28 + -8 -15r = 28 + -8 Combine like terms: 28 + -8 = 20 -15r = 20 Divide each side by '-15'. r = -1.333333333 Simplifying r = -1.333333333
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