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Simplifying -7(r + -4s + -8t) = 0 (r * -7 + -4s * -7 + -8t * -7) = 0 (-7r + 28s + 56t) = 0 Solving -7r + 28s + 56t = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-28s' to each side of the equation. -7r + 28s + -28s + 56t = 0 + -28s Combine like terms: 28s + -28s = 0 -7r + 0 + 56t = 0 + -28s -7r + 56t = 0 + -28s Remove the zero: -7r + 56t = -28s Add '-56t' to each side of the equation. -7r + 56t + -56t = -28s + -56t Combine like terms: 56t + -56t = 0 -7r + 0 = -28s + -56t -7r = -28s + -56t Divide each side by '-7'. r = 4s + 8t Simplifying r = 4s + 8t
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