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Simplifying -1(r + -4) = 1 Reorder the terms: -1(-4 + r) = 1 (-4 * -1 + r * -1) = 1 (4 + -1r) = 1 Solving 4 + -1r = 1 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1r = 1 + -4 Combine like terms: 4 + -4 = 0 0 + -1r = 1 + -4 -1r = 1 + -4 Combine like terms: 1 + -4 = -3 -1r = -3 Divide each side by '-1'. r = 3 Simplifying r = 3
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