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Simplifying -9(r + -10) = 27 Reorder the terms: -9(-10 + r) = 27 (-10 * -9 + r * -9) = 27 (90 + -9r) = 27 Solving 90 + -9r = 27 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-90' to each side of the equation. 90 + -90 + -9r = 27 + -90 Combine like terms: 90 + -90 = 0 0 + -9r = 27 + -90 -9r = 27 + -90 Combine like terms: 27 + -90 = -63 -9r = -63 Divide each side by '-9'. r = 7 Simplifying r = 7
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