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Simplifying 13r + s + -20r + 20s = 0 Reorder the terms: 13r + -20r + s + 20s = 0 Combine like terms: 13r + -20r = -7r -7r + s + 20s = 0 Combine like terms: s + 20s = 21s -7r + 21s = 0 Solving -7r + 21s = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-21s' to each side of the equation. -7r + 21s + -21s = 0 + -21s Combine like terms: 21s + -21s = 0 -7r + 0 = 0 + -21s -7r = 0 + -21s Remove the zero: -7r = -21s Divide each side by '-7'. r = 3s Simplifying r = 3s
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