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Simplifying 3(-4x + 7) = -123 Reorder the terms: 3(7 + -4x) = -123 (7 * 3 + -4x * 3) = -123 (21 + -12x) = -123 Solving 21 + -12x = -123 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 + -12x = -123 + -21 Combine like terms: 21 + -21 = 0 0 + -12x = -123 + -21 -12x = -123 + -21 Combine like terms: -123 + -21 = -144 -12x = -144 Divide each side by '-12'. x = 12 Simplifying x = 12
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