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Simplifying 9 + 2r = -6r + 9 + -9r Reorder the terms: 9 + 2r = 9 + -6r + -9r Combine like terms: -6r + -9r = -15r 9 + 2r = 9 + -15r Add '-9' to each side of the equation. 9 + -9 + 2r = 9 + -9 + -15r Combine like terms: 9 + -9 = 0 0 + 2r = 9 + -9 + -15r 2r = 9 + -9 + -15r Combine like terms: 9 + -9 = 0 2r = 0 + -15r 2r = -15r Solving 2r = -15r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '15r' to each side of the equation. 2r + 15r = -15r + 15r Combine like terms: 2r + 15r = 17r 17r = -15r + 15r Combine like terms: -15r + 15r = 0 17r = 0 Divide each side by '17'. r = 0 Simplifying r = 0
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