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Simplifying 9x + -4 + 3x + 1 = 21 Reorder the terms: -4 + 1 + 9x + 3x = 21 Combine like terms: -4 + 1 = -3 -3 + 9x + 3x = 21 Combine like terms: 9x + 3x = 12x -3 + 12x = 21 Solving -3 + 12x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 12x = 21 + 3 Combine like terms: -3 + 3 = 0 0 + 12x = 21 + 3 12x = 21 + 3 Combine like terms: 21 + 3 = 24 12x = 24 Divide each side by '12'. x = 2 Simplifying x = 2
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