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Simplifying 8r + -1(5r + 9) = 27 Reorder the terms: 8r + -1(9 + 5r) = 27 8r + (9 * -1 + 5r * -1) = 27 8r + (-9 + -5r) = 27 Reorder the terms: -9 + 8r + -5r = 27 Combine like terms: 8r + -5r = 3r -9 + 3r = 27 Solving -9 + 3r = 27 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 3r = 27 + 9 Combine like terms: -9 + 9 = 0 0 + 3r = 27 + 9 3r = 27 + 9 Combine like terms: 27 + 9 = 36 3r = 36 Divide each side by '3'. r = 12 Simplifying r = 12
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