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Simplifying 3r + 12 = -8r + 210 Reorder the terms: 12 + 3r = -8r + 210 Reorder the terms: 12 + 3r = 210 + -8r Solving 12 + 3r = 210 + -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 = 210 + -8r + 8r Combine like terms: 3r + 8r = 11r 12 + 11r = 210 + -8r + 8r Combine like terms: -8r + 8r = 0 12 + 11r = 210 + 0 12 + 11r = 210 Add '-12' to each side of the equation. 12 + -12 + 11r = 210 + -12 Combine like terms: 12 + -12 = 0 0 + 11r = 210 + -12 11r = 210 + -12 Combine like terms: 210 + -12 = 198 11r = 198 Divide each side by '11'. r = 18 Simplifying r = 18
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