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Simplifying -3[x + -7] = -12 Reorder the terms: -3[-7 + x] = -12 [-7 * -3 + x * -3] = -12 [21 + -3x] = -12 Solving 21 + -3x = -12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -3x = -12 + -21 Combine like terms: 21 + -21 = 0 0 + -3x = -12 + -21 -3x = -12 + -21 Combine like terms: -12 + -21 = -33 -3x = -33 Divide each side by '-3'. x = 11 Simplifying x = 11
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