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Simplifying 18 = 3r + 3r Combine like terms: 3r + 3r = 6r 18 = 6r Solving 18 = 6r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-6r' to each side of the equation. 18 + -6r = 6r + -6r Combine like terms: 6r + -6r = 0 18 + -6r = 0 Add '-18' to each side of the equation. 18 + -18 + -6r = 0 + -18 Combine like terms: 18 + -18 = 0 0 + -6r = 0 + -18 -6r = 0 + -18 Combine like terms: 0 + -18 = -18 -6r = -18 Divide each side by '-6'. r = 3 Simplifying r = 3
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