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Simplifying -9 = -7r + -2r Combine like terms: -7r + -2r = -9r -9 = -9r Solving -9 = -9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9r' to each side of the equation. -9 + 9r = -9r + 9r Combine like terms: -9r + 9r = 0 -9 + 9r = 0 Add '9' to each side of the equation. -9 + 9 + 9r = 0 + 9 Combine like terms: -9 + 9 = 0 0 + 9r = 0 + 9 9r = 0 + 9 Combine like terms: 0 + 9 = 9 9r = 9 Divide each side by '9'. r = 1 Simplifying r = 1
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