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Simplifying 21 + 3x = 51 Solving 21 + 3x = 51 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 3x = 51 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = 51 + -21 3x = 51 + -21 Combine like terms: 51 + -21 = 30 3x = 30 Divide each side by '3'. x = 10 Simplifying x = 10
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