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Simplifying r + -1(5r + -3) = 9 Reorder the terms: r + -1(-3 + 5r) = 9 r + (-3 * -1 + 5r * -1) = 9 r + (3 + -5r) = 9 Reorder the terms: 3 + r + -5r = 9 Combine like terms: r + -5r = -4r 3 + -4r = 9 Solving 3 + -4r = 9 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -4r = 9 + -3 Combine like terms: 3 + -3 = 0 0 + -4r = 9 + -3 -4r = 9 + -3 Combine like terms: 9 + -3 = 6 -4r = 6 Divide each side by '-4'. r = -1.5 Simplifying r = -1.5
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