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Simplifying 7 + -7 + 2r + 18 = 0 Reorder the terms: 7 + -7 + 18 + 2r = 0 Combine like terms: 7 + -7 = 0 0 + 18 + 2r = 0 18 + 2r = 0 Solving 18 + 2r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 2r = 0 + -18 Combine like terms: 18 + -18 = 0 0 + 2r = 0 + -18 2r = 0 + -18 Combine like terms: 0 + -18 = -18 2r = -18 Divide each side by '2'. r = -9 Simplifying r = -9
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