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Simplifying 2(r + 9) + -28 = 0 Reorder the terms: 2(9 + r) + -28 = 0 (9 * 2 + r * 2) + -28 = 0 (18 + 2r) + -28 = 0 Reorder the terms: 18 + -28 + 2r = 0 Combine like terms: 18 + -28 = -10 -10 + 2r = 0 Solving -10 + 2r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + 2r = 0 + 10 Combine like terms: -10 + 10 = 0 0 + 2r = 0 + 10 2r = 0 + 10 Combine like terms: 0 + 10 = 10 2r = 10 Divide each side by '2'. r = 5 Simplifying r = 5
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