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Simplifying 20 + -1r = 8 Solving 20 + -1r = 8 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -1r = 8 + -20 Combine like terms: 20 + -20 = 0 0 + -1r = 8 + -20 -1r = 8 + -20 Combine like terms: 8 + -20 = -12 -1r = -12 Divide each side by '-1'. r = 12 Simplifying r = 12
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