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Simplifying 12x + 21 = x + 12 Reorder the terms: 21 + 12x = x + 12 Reorder the terms: 21 + 12x = 12 + x Solving 21 + 12x = 12 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 21 + 12x + -1x = 12 + x + -1x Combine like terms: 12x + -1x = 11x 21 + 11x = 12 + x + -1x Combine like terms: x + -1x = 0 21 + 11x = 12 + 0 21 + 11x = 12 Add '-21' to each side of the equation. 21 + -21 + 11x = 12 + -21 Combine like terms: 21 + -21 = 0 0 + 11x = 12 + -21 11x = 12 + -21 Combine like terms: 12 + -21 = -9 11x = -9 Divide each side by '11'. x = -0.8181818182 Simplifying x = -0.8181818182
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