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