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Simplifying -20 = 12 + 8r Solving -20 = 12 + 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. -20 + -8r = 12 + 8r + -8r Combine like terms: 8r + -8r = 0 -20 + -8r = 12 + 0 -20 + -8r = 12 Add '20' to each side of the equation. -20 + 20 + -8r = 12 + 20 Combine like terms: -20 + 20 = 0 0 + -8r = 12 + 20 -8r = 12 + 20 Combine like terms: 12 + 20 = 32 -8r = 32 Divide each side by '-8'. r = -4 Simplifying r = -4
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