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Simplifying -7(3 + -1r) = 35 (3 * -7 + -1r * -7) = 35 (-21 + 7r) = 35 Solving -21 + 7r = 35 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 7r = 35 + 21 Combine like terms: -21 + 21 = 0 0 + 7r = 35 + 21 7r = 35 + 21 Combine like terms: 35 + 21 = 56 7r = 56 Divide each side by '7'. r = 8 Simplifying r = 8
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