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