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Simplifying -4(r + -4s + -9t) = 0 (r * -4 + -4s * -4 + -9t * -4) = 0 (-4r + 16s + 36t) = 0 Solving -4r + 16s + 36t = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-16s' to each side of the equation. -4r + 16s + -16s + 36t = 0 + -16s Combine like terms: 16s + -16s = 0 -4r + 0 + 36t = 0 + -16s -4r + 36t = 0 + -16s Remove the zero: -4r + 36t = -16s Add '-36t' to each side of the equation. -4r + 36t + -36t = -16s + -36t Combine like terms: 36t + -36t = 0 -4r + 0 = -16s + -36t -4r = -16s + -36t Divide each side by '-4'. r = 4s + 9t Simplifying r = 4s + 9t
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