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Simplifying 5r + 9 + -7r = -27 Reorder the terms: 9 + 5r + -7r = -27 Combine like terms: 5r + -7r = -2r 9 + -2r = -27 Solving 9 + -2r = -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 + -2r = -27 + -9 Combine like terms: 9 + -9 = 0 0 + -2r = -27 + -9 -2r = -27 + -9 Combine like terms: -27 + -9 = -36 -2r = -36 Divide each side by '-2'. r = 18 Simplifying r = 18
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