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Simplifying 6(3r + -1) = 138 Reorder the terms: 6(-1 + 3r) = 138 (-1 * 6 + 3r * 6) = 138 (-6 + 18r) = 138 Solving -6 + 18r = 138 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 18r = 138 + 6 Combine like terms: -6 + 6 = 0 0 + 18r = 138 + 6 18r = 138 + 6 Combine like terms: 138 + 6 = 144 18r = 144 Divide each side by '18'. r = 8 Simplifying r = 8
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