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Simplifying -5 + 2(1 + 6r) = 21 -5 + (1 * 2 + 6r * 2) = 21 -5 + (2 + 12r) = 21 Combine like terms: -5 + 2 = -3 -3 + 12r = 21 Solving -3 + 12r = 21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 12r = 21 + 3 Combine like terms: -3 + 3 = 0 0 + 12r = 21 + 3 12r = 21 + 3 Combine like terms: 21 + 3 = 24 12r = 24 Divide each side by '12'. r = 2 Simplifying r = 2
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