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Simplifying -7(5 + -1r) = 21 (5 * -7 + -1r * -7) = 21 (-35 + 7r) = 21 Solving -35 + 7r = 21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '35' to each side of the equation. -35 + 35 + 7r = 21 + 35 Combine like terms: -35 + 35 = 0 0 + 7r = 21 + 35 7r = 21 + 35 Combine like terms: 21 + 35 = 56 7r = 56 Divide each side by '7'. r = 8 Simplifying r = 8
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