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Simplifying 5x + 9 + -2x = 21 Reorder the terms: 9 + 5x + -2x = 21 Combine like terms: 5x + -2x = 3x 9 + 3x = 21 Solving 9 + 3x = 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 + 3x = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 3x = 21 + -9 3x = 21 + -9 Combine like terms: 21 + -9 = 12 3x = 12 Divide each side by '3'. x = 4 Simplifying x = 4
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