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Simplifying 9 + r + 2r = r + 1 + 4 Combine like terms: r + 2r = 3r 9 + 3r = r + 1 + 4 Reorder the terms: 9 + 3r = 1 + 4 + r Combine like terms: 1 + 4 = 5 9 + 3r = 5 + r Solving 9 + 3r = 5 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 9 + 3r + -1r = 5 + r + -1r Combine like terms: 3r + -1r = 2r 9 + 2r = 5 + r + -1r Combine like terms: r + -1r = 0 9 + 2r = 5 + 0 9 + 2r = 5 Add '-9' to each side of the equation. 9 + -9 + 2r = 5 + -9 Combine like terms: 9 + -9 = 0 0 + 2r = 5 + -9 2r = 5 + -9 Combine like terms: 5 + -9 = -4 2r = -4 Divide each side by '2'. r = -2 Simplifying r = -2
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