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Simplifying 31 = r + 16 Reorder the terms: 31 = 16 + r Solving 31 = 16 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 31 + -1r = 16 + r + -1r Combine like terms: r + -1r = 0 31 + -1r = 16 + 0 31 + -1r = 16 Add '-31' to each side of the equation. 31 + -31 + -1r = 16 + -31 Combine like terms: 31 + -31 = 0 0 + -1r = 16 + -31 -1r = 16 + -31 Combine like terms: 16 + -31 = -15 -1r = -15 Divide each side by '-1'. r = 15 Simplifying r = 15
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