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Simplifying 400 = 20r Solving 400 = 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. 400 + -20r = 20r + -20r Combine like terms: 20r + -20r = 0 400 + -20r = 0 Add '-400' to each side of the equation. 400 + -400 + -20r = 0 + -400 Combine like terms: 400 + -400 = 0 0 + -20r = 0 + -400 -20r = 0 + -400 Combine like terms: 0 + -400 = -400 -20r = -400 Divide each side by '-20'. r = 20 Simplifying r = 20
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