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Simplifying 126 = 3(7 + -7x) 126 = (7 * 3 + -7x * 3) 126 = (21 + -21x) Solving 126 = 21 + -21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21x' to each side of the equation. 126 + 21x = 21 + -21x + 21x Combine like terms: -21x + 21x = 0 126 + 21x = 21 + 0 126 + 21x = 21 Add '-126' to each side of the equation. 126 + -126 + 21x = 21 + -126 Combine like terms: 126 + -126 = 0 0 + 21x = 21 + -126 21x = 21 + -126 Combine like terms: 21 + -126 = -105 21x = -105 Divide each side by '21'. x = -5 Simplifying x = -5
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