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Simplifying 28 = 3 + 2(r + 9) Reorder the terms: 28 = 3 + 2(9 + r) 28 = 3 + (9 * 2 + r * 2) 28 = 3 + (18 + 2r) Combine like terms: 3 + 18 = 21 28 = 21 + 2r Solving 28 = 21 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. 28 + -2r = 21 + 2r + -2r Combine like terms: 2r + -2r = 0 28 + -2r = 21 + 0 28 + -2r = 21 Add '-28' to each side of the equation. 28 + -28 + -2r = 21 + -28 Combine like terms: 28 + -28 = 0 0 + -2r = 21 + -28 -2r = 21 + -28 Combine like terms: 21 + -28 = -7 -2r = -7 Divide each side by '-2'. r = 3.5 Simplifying r = 3.5
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