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Simplifying -3(-4x + 7) = -21 Reorder the terms: -3(7 + -4x) = -21 (7 * -3 + -4x * -3) = -21 (-21 + 12x) = -21 Add '21' to each side of the equation. -21 + 21 + 12x = -21 + 21 Combine like terms: -21 + 21 = 0 0 + 12x = -21 + 21 12x = -21 + 21 Combine like terms: -21 + 21 = 0 12x = 0 Solving 12x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '12'. x = 0 Simplifying x = 0
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