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Simplifying [r + 5] = 12 Reorder the terms: [5 + r] = 12 Remove brackets around [5 + r] 5 + r = 12 Solving 5 + r = 12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + r = 12 + -5 Combine like terms: 5 + -5 = 0 0 + r = 12 + -5 r = 12 + -5 Combine like terms: 12 + -5 = 7 r = 7 Simplifying r = 7
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