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Simplifying 7x + 5x = 21 + 9x Combine like terms: 7x + 5x = 12x 12x = 21 + 9x Solving 12x = 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. 12x + -9x = 21 + 9x + -9x Combine like terms: 12x + -9x = 3x 3x = 21 + 9x + -9x Combine like terms: 9x + -9x = 0 3x = 21 + 0 3x = 21 Divide each side by '3'. x = 7 Simplifying x = 7
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