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Simplifying 0 = 40 + 20r Solving 0 = 40 + 20r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-20r' to each side of the equation. 0 + -20r = 40 + 20r + -20r Remove the zero: -20r = 40 + 20r + -20r Combine like terms: 20r + -20r = 0 -20r = 40 + 0 -20r = 40 Divide each side by '-20'. r = -2 Simplifying r = -2
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