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Simplifying 3x + 21 = 12x Reorder the terms: 21 + 3x = 12x Solving 21 + 3x = 12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12x' to each side of the equation. 21 + 3x + -12x = 12x + -12x Combine like terms: 3x + -12x = -9x 21 + -9x = 12x + -12x Combine like terms: 12x + -12x = 0 21 + -9x = 0 Add '-21' to each side of the equation. 21 + -21 + -9x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -9x = 0 + -21 -9x = 0 + -21 Combine like terms: 0 + -21 = -21 -9x = -21 Divide each side by '-9'. x = 2.333333333 Simplifying x = 2.333333333
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