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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 = -26 -26 + -8r + 15r = 0 Combine like terms: -8r + 15r = 7r -26 + 7r = 0 Solving -26 + 7r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '26' to each side of the equation. -26 + 26 + 7r = 0 + 26 Combine like terms: -26 + 26 = 0 0 + 7r = 0 + 26 7r = 0 + 26 Combine like terms: 0 + 26 = 26 7r = 26 Divide each side by '7'. r = 3.714285714 Simplifying r = 3.714285714
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