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Simplifying -7(-3x + 3) = -126 Reorder the terms: -7(3 + -3x) = -126 (3 * -7 + -3x * -7) = -126 (-21 + 21x) = -126 Solving -21 + 21x = -126 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 + 21x = -126 + 21 Combine like terms: -21 + 21 = 0 0 + 21x = -126 + 21 21x = -126 + 21 Combine like terms: -126 + 21 = -105 21x = -105 Divide each side by '21'. x = -5 Simplifying x = -5
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