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Simplifying 21r + -1(7r + 14) = 28 Reorder the terms: 21r + -1(14 + 7r) = 28 21r + (14 * -1 + 7r * -1) = 28 21r + (-14 + -7r) = 28 Reorder the terms: -14 + 21r + -7r = 28 Combine like terms: 21r + -7r = 14r -14 + 14r = 28 Solving -14 + 14r = 28 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + 14r = 28 + 14 Combine like terms: -14 + 14 = 0 0 + 14r = 28 + 14 14r = 28 + 14 Combine like terms: 28 + 14 = 42 14r = 42 Divide each side by '14'. r = 3 Simplifying r = 3
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