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Simplifying 2.10x + 12.99 = 21.39 Reorder the terms: 12.99 + 2.10x = 21.39 Solving 12.99 + 2.10x = 21.39 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12.99' to each side of the equation. 12.99 + -12.99 + 2.10x = 21.39 + -12.99 Combine like terms: 12.99 + -12.99 = 0.00 0.00 + 2.10x = 21.39 + -12.99 2.10x = 21.39 + -12.99 Combine like terms: 21.39 + -12.99 = 8.4 2.10x = 8.4 Divide each side by '2.10'. x = 4 Simplifying x = 4
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