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Simplifying -4(2r + -6) + -1 = -9 Reorder the terms: -4(-6 + 2r) + -1 = -9 (-6 * -4 + 2r * -4) + -1 = -9 (24 + -8r) + -1 = -9 Reorder the terms: 24 + -1 + -8r = -9 Combine like terms: 24 + -1 = 23 23 + -8r = -9 Solving 23 + -8r = -9 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-23' to each side of the equation. 23 + -23 + -8r = -9 + -23 Combine like terms: 23 + -23 = 0 0 + -8r = -9 + -23 -8r = -9 + -23 Combine like terms: -9 + -23 = -32 -8r = -32 Divide each side by '-8'. r = 4 Simplifying r = 4
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