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Simplifying -5(4 + -1r) = 15 (4 * -5 + -1r * -5) = 15 (-20 + 5r) = 15 Solving -20 + 5r = 15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + 5r = 15 + 20 Combine like terms: -20 + 20 = 0 0 + 5r = 15 + 20 5r = 15 + 20 Combine like terms: 15 + 20 = 35 5r = 35 Divide each side by '5'. r = 7 Simplifying r = 7
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