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Simplifying 18 = 2r + 8 Reorder the terms: 18 = 8 + 2r Solving 18 = 8 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. 18 + -2r = 8 + 2r + -2r Combine like terms: 2r + -2r = 0 18 + -2r = 8 + 0 18 + -2r = 8 Add '-18' to each side of the equation. 18 + -18 + -2r = 8 + -18 Combine like terms: 18 + -18 = 0 0 + -2r = 8 + -18 -2r = 8 + -18 Combine like terms: 8 + -18 = -10 -2r = -10 Divide each side by '-2'. r = 5 Simplifying r = 5
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