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Simplifying 126 + -9x = 21x + 21 Reorder the terms: 126 + -9x = 21 + 21x Solving 126 + -9x = 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. 126 + -9x + -21x = 21 + 21x + -21x Combine like terms: -9x + -21x = -30x 126 + -30x = 21 + 21x + -21x Combine like terms: 21x + -21x = 0 126 + -30x = 21 + 0 126 + -30x = 21 Add '-126' to each side of the equation. 126 + -126 + -30x = 21 + -126 Combine like terms: 126 + -126 = 0 0 + -30x = 21 + -126 -30x = 21 + -126 Combine like terms: 21 + -126 = -105 -30x = -105 Divide each side by '-30'. x = 3.5 Simplifying x = 3.5
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