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Simplifying -4(2r + 2) + 15r + 18 = 0 Reorder the terms: -4(2 + 2r) + 15r + 18 = 0 (2 * -4 + 2r * -4) + 15r + 18 = 0 (-8 + -8r) + 15r + 18 = 0 Reorder the terms: -8 + 18 + -8r + 15r = 0 Combine like terms: -8 + 18 = 10 10 + -8r + 15r = 0 Combine like terms: -8r + 15r = 7r 10 + 7r = 0 Solving 10 + 7r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + 7r = 0 + -10 Combine like terms: 10 + -10 = 0 0 + 7r = 0 + -10 7r = 0 + -10 Combine like terms: 0 + -10 = -10 7r = -10 Divide each side by '7'. r = -1.428571429 Simplifying r = -1.428571429
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