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Simplifying 4r + -12s + 9t = 0 Solving 4r + -12s + 9t = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12s' to each side of the equation. 4r + -12s + 12s + 9t = 0 + 12s Combine like terms: -12s + 12s = 0 4r + 0 + 9t = 0 + 12s 4r + 9t = 0 + 12s Remove the zero: 4r + 9t = 12s Add '-9t' to each side of the equation. 4r + 9t + -9t = 12s + -9t Combine like terms: 9t + -9t = 0 4r + 0 = 12s + -9t 4r = 12s + -9t Divide each side by '4'. r = 3s + -2.25t Simplifying r = 3s + -2.25t
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