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Simplifying -123 = -3(7x + 6) Reorder the terms: -123 = -3(6 + 7x) -123 = (6 * -3 + 7x * -3) -123 = (-18 + -21x) Solving -123 = -18 + -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. -123 + 21x = -18 + -21x + 21x Combine like terms: -21x + 21x = 0 -123 + 21x = -18 + 0 -123 + 21x = -18 Add '123' to each side of the equation. -123 + 123 + 21x = -18 + 123 Combine like terms: -123 + 123 = 0 0 + 21x = -18 + 123 21x = -18 + 123 Combine like terms: -18 + 123 = 105 21x = 105 Divide each side by '21'. x = 5 Simplifying x = 5
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