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Simplifying 15 = r + 8 Reorder the terms: 15 = 8 + r Solving 15 = 8 + 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. 15 + -1r = 8 + r + -1r Combine like terms: r + -1r = 0 15 + -1r = 8 + 0 15 + -1r = 8 Add '-15' to each side of the equation. 15 + -15 + -1r = 8 + -15 Combine like terms: 15 + -15 = 0 0 + -1r = 8 + -15 -1r = 8 + -15 Combine like terms: 8 + -15 = -7 -1r = -7 Divide each side by '-1'. r = 7 Simplifying r = 7
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