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Simplifying 12r + 21s = 0 Solving 12r + 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. 12r + 21s + -21s = 0 + -21s Combine like terms: 21s + -21s = 0 12r + 0 = 0 + -21s 12r = 0 + -21s Remove the zero: 12r = -21s Divide each side by '12'. r = -1.75s Simplifying r = -1.75s
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