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Simplifying -3(r + -3s + -7) = 0 Reorder the terms: -3(-7 + r + -3s) = 0 (-7 * -3 + r * -3 + -3s * -3) = 0 (21 + -3r + 9s) = 0 Solving 21 + -3r + 9s = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -3r + -21 + 9s = 0 + -21 Reorder the terms: 21 + -21 + -3r + 9s = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -3r + 9s = 0 + -21 -3r + 9s = 0 + -21 Combine like terms: 0 + -21 = -21 -3r + 9s = -21 Add '-9s' to each side of the equation. -3r + 9s + -9s = -21 + -9s Combine like terms: 9s + -9s = 0 -3r + 0 = -21 + -9s -3r = -21 + -9s Divide each side by '-3'. r = 7 + 3s Simplifying r = 7 + 3s
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