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Simplifying 2r + 3s + 12t = 28 Solving 2r + 3s + 12t = 28 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3s' to each side of the equation. 2r + 3s + -3s + 12t = 28 + -3s Combine like terms: 3s + -3s = 0 2r + 0 + 12t = 28 + -3s 2r + 12t = 28 + -3s Add '-12t' to each side of the equation. 2r + 12t + -12t = 28 + -3s + -12t Combine like terms: 12t + -12t = 0 2r + 0 = 28 + -3s + -12t 2r = 28 + -3s + -12t Divide each side by '2'. r = 14 + -1.5s + -6t Simplifying r = 14 + -1.5s + -6t
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