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Simplifying -12 = 1r + -1 Reorder the terms: -12 = -1 + 1r Solving -12 = -1 + 1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. -12 + -1r = -1 + 1r + -1r Combine like terms: 1r + -1r = 0 -12 + -1r = -1 + 0 -12 + -1r = -1 Add '12' to each side of the equation. -12 + 12 + -1r = -1 + 12 Combine like terms: -12 + 12 = 0 0 + -1r = -1 + 12 -1r = -1 + 12 Combine like terms: -1 + 12 = 11 -1r = 11 Divide each side by '-1'. r = -11 Simplifying r = -11
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