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Simplifying 123 + -6x = 12 + 21x Solving 123 + -6x = 12 + 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 = 12 + 21x + -21x Combine like terms: -6x + -21x = -27x 123 + -27x = 12 + 21x + -21x Combine like terms: 21x + -21x = 0 123 + -27x = 12 + 0 123 + -27x = 12 Add '-123' to each side of the equation. 123 + -123 + -27x = 12 + -123 Combine like terms: 123 + -123 = 0 0 + -27x = 12 + -123 -27x = 12 + -123 Combine like terms: 12 + -123 = -111 -27x = -111 Divide each side by '-27'. x = 4.111111111 Simplifying x = 4.111111111
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