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Simplifying 3x + -9 + 4x = -12 Reorder the terms: -9 + 3x + 4x = -12 Combine like terms: 3x + 4x = 7x -9 + 7x = -12 Solving -9 + 7x = -12 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 + 7x = -12 + 9 Combine like terms: -9 + 9 = 0 0 + 7x = -12 + 9 7x = -12 + 9 Combine like terms: -12 + 9 = -3 7x = -3 Divide each side by '7'. x = -0.4285714286 Simplifying x = -0.4285714286
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