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