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Simplifying 9r + -9 + r + -1 = 0 Reorder the terms: -9 + -1 + 9r + r = 0 Combine like terms: -9 + -1 = -10 -10 + 9r + r = 0 Combine like terms: 9r + r = 10r -10 + 10r = 0 Solving -10 + 10r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + 10r = 0 + 10 Combine like terms: -10 + 10 = 0 0 + 10r = 0 + 10 10r = 0 + 10 Combine like terms: 0 + 10 = 10 10r = 10 Divide each side by '10'. r = 1 Simplifying r = 1
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