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Simplifying 3x + -4 + 9x = 28 Reorder the terms: -4 + 3x + 9x = 28 Combine like terms: 3x + 9x = 12x -4 + 12x = 28 Solving -4 + 12x = 28 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 = 28 + 4 Combine like terms: -4 + 4 = 0 0 + 12x = 28 + 4 12x = 28 + 4 Combine like terms: 28 + 4 = 32 12x = 32 Divide each side by '12'. x = 2.666666667 Simplifying x = 2.666666667
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