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Simplifying 3(2r + 5) + -7 = 0 Reorder the terms: 3(5 + 2r) + -7 = 0 (5 * 3 + 2r * 3) + -7 = 0 (15 + 6r) + -7 = 0 Reorder the terms: 15 + -7 + 6r = 0 Combine like terms: 15 + -7 = 8 8 + 6r = 0 Solving 8 + 6r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 6r = 0 + -8 Combine like terms: 8 + -8 = 0 0 + 6r = 0 + -8 6r = 0 + -8 Combine like terms: 0 + -8 = -8 6r = -8 Divide each side by '6'. r = -1.333333333 Simplifying r = -1.333333333
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