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Simplifying -3(7x + -7) = 126 Reorder the terms: -3(-7 + 7x) = 126 (-7 * -3 + 7x * -3) = 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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