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Simplifying 12 = -1r + -11 Reorder the terms: 12 = -11 + -1r Solving 12 = -11 + -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. 12 + r = -11 + -1r + r Combine like terms: -1r + r = 0 12 + r = -11 + 0 12 + r = -11 Add '-12' to each side of the equation. 12 + -12 + r = -11 + -12 Combine like terms: 12 + -12 = 0 0 + r = -11 + -12 r = -11 + -12 Combine like terms: -11 + -12 = -23 r = -23 Simplifying r = -23
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