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Simplifying -5r + -2(r + 3) = 9 Reorder the terms: -5r + -2(3 + r) = 9 -5r + (3 * -2 + r * -2) = 9 -5r + (-6 + -2r) = 9 Reorder the terms: -6 + -5r + -2r = 9 Combine like terms: -5r + -2r = -7r -6 + -7r = 9 Solving -6 + -7r = 9 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + -7r = 9 + 6 Combine like terms: -6 + 6 = 0 0 + -7r = 9 + 6 -7r = 9 + 6 Combine like terms: 9 + 6 = 15 -7r = 15 Divide each side by '-7'. r = -2.142857143 Simplifying r = -2.142857143
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