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Simplifying 27 = 72 + -1r Solving 27 = 72 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. 27 + r = 72 + -1r + r Combine like terms: -1r + r = 0 27 + r = 72 + 0 27 + r = 72 Add '-27' to each side of the equation. 27 + -27 + r = 72 + -27 Combine like terms: 27 + -27 = 0 0 + r = 72 + -27 r = 72 + -27 Combine like terms: 72 + -27 = 45 r = 45 Simplifying r = 45
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