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Simplifying 123 + -6x = 21x + 21 Reorder the terms: 123 + -6x = 21 + 21x Solving 123 + -6x = 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. 123 + -6x + -21x = 21 + 21x + -21x Combine like terms: -6x + -21x = -27x 123 + -27x = 21 + 21x + -21x Combine like terms: 21x + -21x = 0 123 + -27x = 21 + 0 123 + -27x = 21 Add '-123' to each side of the equation. 123 + -123 + -27x = 21 + -123 Combine like terms: 123 + -123 = 0 0 + -27x = 21 + -123 -27x = 21 + -123 Combine like terms: 21 + -123 = -102 -27x = -102 Divide each side by '-27'. x = 3.777777778 Simplifying x = 3.777777778
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