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Simplifying -9 = 3r + 6r Combine like terms: 3r + 6r = 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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