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Simplifying 3x + -9 + -2x = -21 Reorder the terms: -9 + 3x + -2x = -21 Combine like terms: 3x + -2x = 1x -9 + 1x = -21 Solving -9 + 1x = -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 + 1x = -21 + 9 Combine like terms: -9 + 9 = 0 0 + 1x = -21 + 9 1x = -21 + 9 Combine like terms: -21 + 9 = -12 1x = -12 Divide each side by '1'. x = -12 Simplifying x = -12
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