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Simplifying -2r + s + 4t = -9 Solving -2r + s + 4t = -9 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1s' to each side of the equation. -2r + s + -1s + 4t = -9 + -1s Combine like terms: s + -1s = 0 -2r + 0 + 4t = -9 + -1s -2r + 4t = -9 + -1s Add '-4t' to each side of the equation. -2r + 4t + -4t = -9 + -1s + -4t Combine like terms: 4t + -4t = 0 -2r + 0 = -9 + -1s + -4t -2r = -9 + -1s + -4t Divide each side by '-2'. r = 4.5 + 0.5s + 2t Simplifying r = 4.5 + 0.5s + 2t
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