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Simplifying 138 + -6x = 21x + 18 Reorder the terms: 138 + -6x = 18 + 21x Solving 138 + -6x = 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. 138 + -6x + -21x = 18 + 21x + -21x Combine like terms: -6x + -21x = -27x 138 + -27x = 18 + 21x + -21x Combine like terms: 21x + -21x = 0 138 + -27x = 18 + 0 138 + -27x = 18 Add '-138' to each side of the equation. 138 + -138 + -27x = 18 + -138 Combine like terms: 138 + -138 = 0 0 + -27x = 18 + -138 -27x = 18 + -138 Combine like terms: 18 + -138 = -120 -27x = -120 Divide each side by '-27'. x = 4.444444444 Simplifying x = 4.444444444
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