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