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Simplifying 9x + -12x + -21 = 39 Reorder the terms: -21 + 9x + -12x = 39 Combine like terms: 9x + -12x = -3x -21 + -3x = 39 Solving -21 + -3x = 39 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -3x = 39 + 21 Combine like terms: -21 + 21 = 0 0 + -3x = 39 + 21 -3x = 39 + 21 Combine like terms: 39 + 21 = 60 -3x = 60 Divide each side by '-3'. x = -20 Simplifying x = -20
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