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Simplifying 2x + -9 + -3x = 21 Reorder the terms: -9 + 2x + -3x = 21 Combine like terms: 2x + -3x = -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 = 30 -1x = 30 Divide each side by '-1'. x = -30 Simplifying x = -30
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