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