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Simplifying 6x + -4x + 9 = 21 Reorder the terms: 9 + 6x + -4x = 21 Combine like terms: 6x + -4x = 2x 9 + 2x = 21 Solving 9 + 2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 2x = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 2x = 21 + -9 2x = 21 + -9 Combine like terms: 21 + -9 = 12 2x = 12 Divide each side by '2'. x = 6 Simplifying x = 6
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