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