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Simplifying 2r + -9 = 9 + -7r Reorder the terms: -9 + 2r = 9 + -7r Solving -9 + 2r = 9 + -7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7r' to each side of the equation. -9 + 2r + 7r = 9 + -7r + 7r Combine like terms: 2r + 7r = 9r -9 + 9r = 9 + -7r + 7r Combine like terms: -7r + 7r = 0 -9 + 9r = 9 + 0 -9 + 9r = 9 Add '9' to each side of the equation. -9 + 9 + 9r = 9 + 9 Combine like terms: -9 + 9 = 0 0 + 9r = 9 + 9 9r = 9 + 9 Combine like terms: 9 + 9 = 18 9r = 18 Divide each side by '9'. r = 2 Simplifying r = 2
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