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Simplifying 28 = 7(r + 3) Reorder the terms: 28 = 7(3 + r) 28 = (3 * 7 + r * 7) 28 = (21 + 7r) Solving 28 = 21 + 7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7r' to each side of the equation. 28 + -7r = 21 + 7r + -7r Combine like terms: 7r + -7r = 0 28 + -7r = 21 + 0 28 + -7r = 21 Add '-28' to each side of the equation. 28 + -28 + -7r = 21 + -28 Combine like terms: 28 + -28 = 0 0 + -7r = 21 + -28 -7r = 21 + -28 Combine like terms: 21 + -28 = -7 -7r = -7 Divide each side by '-7'. r = 1 Simplifying r = 1
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