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Simplifying r + r + 12 = 100 Reorder the terms: 12 + r + r = 100 Combine like terms: r + r = 2r 12 + 2r = 100 Solving 12 + 2r = 100 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 2r = 100 + -12 Combine like terms: 12 + -12 = 0 0 + 2r = 100 + -12 2r = 100 + -12 Combine like terms: 100 + -12 = 88 2r = 88 Divide each side by '2'. r = 44 Simplifying r = 44
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