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Simplifying 27 = 4r + -7r Combine like terms: 4r + -7r = -3r 27 = -3r Solving 27 = -3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3r' to each side of the equation. 27 + 3r = -3r + 3r Combine like terms: -3r + 3r = 0 27 + 3r = 0 Add '-27' to each side of the equation. 27 + -27 + 3r = 0 + -27 Combine like terms: 27 + -27 = 0 0 + 3r = 0 + -27 3r = 0 + -27 Combine like terms: 0 + -27 = -27 3r = -27 Divide each side by '3'. r = -9 Simplifying r = -9
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