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