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Simplifying r + -3 = -12 Reorder the terms: -3 + r = -12 Solving -3 + r = -12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + r = -12 + 3 Combine like terms: -3 + 3 = 0 0 + r = -12 + 3 r = -12 + 3 Combine like terms: -12 + 3 = -9 r = -9 Simplifying r = -9
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