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Simplifying 18 = 2Nr Solving 18 = 2rN Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2rN' to each side of the equation. 18 + -2rN = 2rN + -2rN Combine like terms: 2rN + -2rN = 0 18 + -2rN = 0 Add '-18' to each side of the equation. 18 + -18 + -2rN = 0 + -18 Combine like terms: 18 + -18 = 0 0 + -2rN = 0 + -18 -2rN = 0 + -18 Combine like terms: 0 + -18 = -18 -2rN = -18 Divide each side by '-2N'. r = 9N-1 Simplifying r = 9N-1
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