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Simplifying -3(r + -7) = -9 Reorder the terms: -3(-7 + r) = -9 (-7 * -3 + r * -3) = -9 (21 + -3r) = -9 Solving 21 + -3r = -9 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 + -21 + -3r = -9 + -21 Combine like terms: 21 + -21 = 0 0 + -3r = -9 + -21 -3r = -9 + -21 Combine like terms: -9 + -21 = -30 -3r = -30 Divide each side by '-3'. r = 10 Simplifying r = 10
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