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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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