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Simplifying 12x + 5 = 21x + 12 Reorder the terms: 5 + 12x = 21x + 12 Reorder the terms: 5 + 12x = 12 + 21x Solving 5 + 12x = 12 + 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. 5 + 12x + -21x = 12 + 21x + -21x Combine like terms: 12x + -21x = -9x 5 + -9x = 12 + 21x + -21x Combine like terms: 21x + -21x = 0 5 + -9x = 12 + 0 5 + -9x = 12 Add '-5' to each side of the equation. 5 + -5 + -9x = 12 + -5 Combine like terms: 5 + -5 = 0 0 + -9x = 12 + -5 -9x = 12 + -5 Combine like terms: 12 + -5 = 7 -9x = 7 Divide each side by '-9'. x = -0.7777777778 Simplifying x = -0.7777777778
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