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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 = 7r -3 + 7r = 13 Solving -3 + 7r = 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 + 7r = 13 + 3 Combine like terms: -3 + 3 = 0 0 + 7r = 13 + 3 7r = 13 + 3 Combine like terms: 13 + 3 = 16 7r = 16 Divide each side by '7'. r = 2.285714286 Simplifying r = 2.285714286
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