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Simplifying 19 = 21 + -1r Solving 19 = 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. 19 + r = 21 + -1r + r Combine like terms: -1r + r = 0 19 + r = 21 + 0 19 + r = 21 Add '-19' to each side of the equation. 19 + -19 + r = 21 + -19 Combine like terms: 19 + -19 = 0 0 + r = 21 + -19 r = 21 + -19 Combine like terms: 21 + -19 = 2 r = 2 Simplifying r = 2
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