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Simplifying 3x + 9 = 9x + 21 Reorder the terms: 9 + 3x = 9x + 21 Reorder the terms: 9 + 3x = 21 + 9x Solving 9 + 3x = 21 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 9 + 3x + -9x = 21 + 9x + -9x Combine like terms: 3x + -9x = -6x 9 + -6x = 21 + 9x + -9x Combine like terms: 9x + -9x = 0 9 + -6x = 21 + 0 9 + -6x = 21 Add '-9' to each side of the equation. 9 + -9 + -6x = 21 + -9 Combine like terms: 9 + -9 = 0 0 + -6x = 21 + -9 -6x = 21 + -9 Combine like terms: 21 + -9 = 12 -6x = 12 Divide each side by '-6'. x = -2 Simplifying x = -2
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