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Simplifying -9(r + -2s + -7t) = 0 (r * -9 + -2s * -9 + -7t * -9) = 0 (-9r + 18s + 63t) = 0 Solving -9r + 18s + 63t = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-18s' to each side of the equation. -9r + 18s + -18s + 63t = 0 + -18s Combine like terms: 18s + -18s = 0 -9r + 0 + 63t = 0 + -18s -9r + 63t = 0 + -18s Remove the zero: -9r + 63t = -18s Add '-63t' to each side of the equation. -9r + 63t + -63t = -18s + -63t Combine like terms: 63t + -63t = 0 -9r + 0 = -18s + -63t -9r = -18s + -63t Divide each side by '-9'. r = 2s + 7t Simplifying r = 2s + 7t
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