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Simplifying 89 = 21 + -1r Solving 89 = 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. 89 + r = 21 + -1r + r Combine like terms: -1r + r = 0 89 + r = 21 + 0 89 + r = 21 Add '-89' to each side of the equation. 89 + -89 + r = 21 + -89 Combine like terms: 89 + -89 = 0 0 + r = 21 + -89 r = 21 + -89 Combine like terms: 21 + -89 = -68 r = -68 Simplifying r = -68
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