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Simplifying -9r + 3 + 4 = -28 Reorder the terms: 3 + 4 + -9r = -28 Combine like terms: 3 + 4 = 7 7 + -9r = -28 Solving 7 + -9r = -28 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -9r = -28 + -7 Combine like terms: 7 + -7 = 0 0 + -9r = -28 + -7 -9r = -28 + -7 Combine like terms: -28 + -7 = -35 -9r = -35 Divide each side by '-9'. r = 3.888888889 Simplifying r = 3.888888889
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