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Simplifying r + 18.5 + -31 = 0 Reorder the terms: 18.5 + -31 + r = 0 Combine like terms: 18.5 + -31 = -12.5 -12.5 + r = 0 Solving -12.5 + r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12.5' to each side of the equation. -12.5 + 12.5 + r = 0 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + r = 0 + 12.5 r = 0 + 12.5 Combine like terms: 0 + 12.5 = 12.5 r = 12.5 Simplifying r = 12.5
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