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Simplifying 6x + -9 + 3x = -21 Reorder the terms: -9 + 6x + 3x = -21 Combine like terms: 6x + 3x = 9x -9 + 9x = -21 Solving -9 + 9x = -21 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 + 9x = -21 + 9 Combine like terms: -9 + 9 = 0 0 + 9x = -21 + 9 9x = -21 + 9 Combine like terms: -21 + 9 = -12 9x = -12 Divide each side by '9'. x = -1.333333333 Simplifying x = -1.333333333
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