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