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Simplifying -7(6 + -1r) = 21 (6 * -7 + -1r * -7) = 21 (-42 + 7r) = 21 Solving -42 + 7r = 21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '42' to each side of the equation. -42 + 42 + 7r = 21 + 42 Combine like terms: -42 + 42 = 0 0 + 7r = 21 + 42 7r = 21 + 42 Combine like terms: 21 + 42 = 63 7r = 63 Divide each side by '7'. r = 9 Simplifying r = 9
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