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Simplifying 12r + 6 = 87 + 9r Reorder the terms: 6 + 12r = 87 + 9r Solving 6 + 12r = 87 + 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. 6 + 12r + -9r = 87 + 9r + -9r Combine like terms: 12r + -9r = 3r 6 + 3r = 87 + 9r + -9r Combine like terms: 9r + -9r = 0 6 + 3r = 87 + 0 6 + 3r = 87 Add '-6' to each side of the equation. 6 + -6 + 3r = 87 + -6 Combine like terms: 6 + -6 = 0 0 + 3r = 87 + -6 3r = 87 + -6 Combine like terms: 87 + -6 = 81 3r = 81 Divide each side by '3'. r = 27 Simplifying r = 27
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