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Simplifying -2[6 + -1r] = 4 [6 * -2 + -1r * -2] = 4 [-12 + 2r] = 4 Solving -12 + 2r = 4 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 + 2r = 4 + 12 Combine like terms: -12 + 12 = 0 0 + 2r = 4 + 12 2r = 4 + 12 Combine like terms: 4 + 12 = 16 2r = 16 Divide each side by '2'. r = 8 Simplifying r = 8
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