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Simplifying 126 + -6x = 21x + 15 Reorder the terms: 126 + -6x = 15 + 21x Solving 126 + -6x = 15 + 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 + -6x + -21x = 15 + 21x + -21x Combine like terms: -6x + -21x = -27x 126 + -27x = 15 + 21x + -21x Combine like terms: 21x + -21x = 0 126 + -27x = 15 + 0 126 + -27x = 15 Add '-126' to each side of the equation. 126 + -126 + -27x = 15 + -126 Combine like terms: 126 + -126 = 0 0 + -27x = 15 + -126 -27x = 15 + -126 Combine like terms: 15 + -126 = -111 -27x = -111 Divide each side by '-27'. x = 4.111111111 Simplifying x = 4.111111111
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