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Simplifying -2r + 18 = 0 Reorder the terms: 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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