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