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Simplifying 9x + 84 = 21x Reorder the terms: 84 + 9x = 21x Solving 84 + 9x = 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. 84 + 9x + -21x = 21x + -21x Combine like terms: 9x + -21x = -12x 84 + -12x = 21x + -21x Combine like terms: 21x + -21x = 0 84 + -12x = 0 Add '-84' to each side of the equation. 84 + -84 + -12x = 0 + -84 Combine like terms: 84 + -84 = 0 0 + -12x = 0 + -84 -12x = 0 + -84 Combine like terms: 0 + -84 = -84 -12x = -84 Divide each side by '-12'. x = 7 Simplifying x = 7
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