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Simplifying 9 = -3[4 + r] 9 = [4 * -3 + r * -3] 9 = [-12 + -3r] Solving 9 = -12 + -3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3r' to each side of the equation. 9 + 3r = -12 + -3r + 3r Combine like terms: -3r + 3r = 0 9 + 3r = -12 + 0 9 + 3r = -12 Add '-9' to each side of the equation. 9 + -9 + 3r = -12 + -9 Combine like terms: 9 + -9 = 0 0 + 3r = -12 + -9 3r = -12 + -9 Combine like terms: -12 + -9 = -21 3r = -21 Divide each side by '3'. r = -7 Simplifying r = -7
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