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Simplifying 6(2r + 1) = -90 Reorder the terms: 6(1 + 2r) = -90 (1 * 6 + 2r * 6) = -90 (6 + 12r) = -90 Solving 6 + 12r = -90 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 + 12r = -90 + -6 Combine like terms: 6 + -6 = 0 0 + 12r = -90 + -6 12r = -90 + -6 Combine like terms: -90 + -6 = -96 12r = -96 Divide each side by '12'. r = -8 Simplifying r = -8
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