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Simplifying -4(5 + -2r) + 1 = 0 (5 * -4 + -2r * -4) + 1 = 0 (-20 + 8r) + 1 = 0 Reorder the terms: -20 + 1 + 8r = 0 Combine like terms: -20 + 1 = -19 -19 + 8r = 0 Solving -19 + 8r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '19' to each side of the equation. -19 + 19 + 8r = 0 + 19 Combine like terms: -19 + 19 = 0 0 + 8r = 0 + 19 8r = 0 + 19 Combine like terms: 0 + 19 = 19 8r = 19 Divide each side by '8'. r = 2.375 Simplifying r = 2.375
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