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Simplifying -3[r + 4] = 21 Reorder the terms: -3[4 + r] = 21 [4 * -3 + r * -3] = 21 [-12 + -3r] = 21 Solving -12 + -3r = 21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + -3r = 21 + 12 Combine like terms: -12 + 12 = 0 0 + -3r = 21 + 12 -3r = 21 + 12 Combine like terms: 21 + 12 = 33 -3r = 33 Divide each side by '-3'. r = -11 Simplifying r = -11
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