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Simplifying -3[-1x + -4] = 42 Reorder the terms: -3[-4 + -1x] = 42 [-4 * -3 + -1x * -3] = 42 [12 + 3x] = 42 Solving 12 + 3x = 42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 3x = 42 + -12 Combine like terms: 12 + -12 = 0 0 + 3x = 42 + -12 3x = 42 + -12 Combine like terms: 42 + -12 = 30 3x = 30 Divide each side by '3'. x = 10 Simplifying x = 10
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