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Simplifying 12r + 3 = r + -9 Reorder the terms: 3 + 12r = r + -9 Reorder the terms: 3 + 12r = -9 + r Solving 3 + 12r = -9 + 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. 3 + 12r + -1r = -9 + r + -1r Combine like terms: 12r + -1r = 11r 3 + 11r = -9 + r + -1r Combine like terms: r + -1r = 0 3 + 11r = -9 + 0 3 + 11r = -9 Add '-3' to each side of the equation. 3 + -3 + 11r = -9 + -3 Combine like terms: 3 + -3 = 0 0 + 11r = -9 + -3 11r = -9 + -3 Combine like terms: -9 + -3 = -12 11r = -12 Divide each side by '11'. r = -1.090909091 Simplifying r = -1.090909091
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