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Simplifying -7(2 + -1r) = 21 (2 * -7 + -1r * -7) = 21 (-14 + 7r) = 21 Solving -14 + 7r = 21 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 + 7r = 21 + 14 Combine like terms: -14 + 14 = 0 0 + 7r = 21 + 14 7r = 21 + 14 Combine like terms: 21 + 14 = 35 7r = 35 Divide each side by '7'. r = 5 Simplifying r = 5
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