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Simplifying 9x + -4 + 3x = 20 Reorder the terms: -4 + 9x + 3x = 20 Combine like terms: 9x + 3x = 12x -4 + 12x = 20 Solving -4 + 12x = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 12x = 20 + 4 Combine like terms: -4 + 4 = 0 0 + 12x = 20 + 4 12x = 20 + 4 Combine like terms: 20 + 4 = 24 12x = 24 Divide each side by '12'. x = 2 Simplifying x = 2
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