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Simplifying -3(2r + -1) + r = 13 Reorder the terms: -3(-1 + 2r) + r = 13 (-1 * -3 + 2r * -3) + r = 13 (3 + -6r) + r = 13 Combine like terms: -6r + r = -5r 3 + -5r = 13 Solving 3 + -5r = 13 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 + -5r = 13 + -3 Combine like terms: 3 + -3 = 0 0 + -5r = 13 + -3 -5r = 13 + -3 Combine like terms: 13 + -3 = 10 -5r = 10 Divide each side by '-5'. r = -2 Simplifying r = -2
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