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Simplifying 6 = 18 + -3r Solving 6 = 18 + -3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3r' to each side of the equation. 6 + 3r = 18 + -3r + 3r Combine like terms: -3r + 3r = 0 6 + 3r = 18 + 0 6 + 3r = 18 Add '-6' to each side of the equation. 6 + -6 + 3r = 18 + -6 Combine like terms: 6 + -6 = 0 0 + 3r = 18 + -6 3r = 18 + -6 Combine like terms: 18 + -6 = 12 3r = 12 Divide each side by '3'. r = 4 Simplifying r = 4
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