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Simplifying -1(4 + -1r) = 9 (4 * -1 + -1r * -1) = 9 (-4 + 1r) = 9 Solving -4 + 1r = 9 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 1r = 9 + 4 Combine like terms: -4 + 4 = 0 0 + 1r = 9 + 4 1r = 9 + 4 Combine like terms: 9 + 4 = 13 1r = 13 Divide each side by '1'. r = 13 Simplifying r = 13
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