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Simplifying 23 = 21 + -1r Solving 23 = 21 + -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. 23 + r = 21 + -1r + r Combine like terms: -1r + r = 0 23 + r = 21 + 0 23 + r = 21 Add '-23' to each side of the equation. 23 + -23 + r = 21 + -23 Combine like terms: 23 + -23 = 0 0 + r = 21 + -23 r = 21 + -23 Combine like terms: 21 + -23 = -2 r = -2 Simplifying r = -2
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