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Simplifying 15 + 8 = r Combine like terms: 15 + 8 = 23 23 = r Solving 23 = 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. 23 + -1r = r + -1r Combine like terms: r + -1r = 0 23 + -1r = 0 Add '-23' to each side of the equation. 23 + -23 + -1r = 0 + -23 Combine like terms: 23 + -23 = 0 0 + -1r = 0 + -23 -1r = 0 + -23 Combine like terms: 0 + -23 = -23 -1r = -23 Divide each side by '-1'. r = 23 Simplifying r = 23
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