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Simplifying 8r + -7r + 1 = 16 Reorder the terms: 1 + 8r + -7r = 16 Combine like terms: 8r + -7r = 1r 1 + 1r = 16 Solving 1 + 1r = 16 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 1r = 16 + -1 Combine like terms: 1 + -1 = 0 0 + 1r = 16 + -1 1r = 16 + -1 Combine like terms: 16 + -1 = 15 1r = 15 Divide each side by '1'. r = 15 Simplifying r = 15
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