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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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