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Simplifying 3r + -12 = 18 + 8r Reorder the terms: -12 + 3r = 18 + 8r Solving -12 + 3r = 18 + 8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8r' to each side of the equation. -12 + 3r + -8r = 18 + 8r + -8r Combine like terms: 3r + -8r = -5r -12 + -5r = 18 + 8r + -8r Combine like terms: 8r + -8r = 0 -12 + -5r = 18 + 0 -12 + -5r = 18 Add '12' to each side of the equation. -12 + 12 + -5r = 18 + 12 Combine like terms: -12 + 12 = 0 0 + -5r = 18 + 12 -5r = 18 + 12 Combine like terms: 18 + 12 = 30 -5r = 30 Divide each side by '-5'. r = -6 Simplifying r = -6
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