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Simplifying 3x + -9 + -5x = -21 Reorder the terms: -9 + 3x + -5x = -21 Combine like terms: 3x + -5x = -2x -9 + -2x = -21 Solving -9 + -2x = -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 + -2x = -21 + 9 Combine like terms: -9 + 9 = 0 0 + -2x = -21 + 9 -2x = -21 + 9 Combine like terms: -21 + 9 = -12 -2x = -12 Divide each side by '-2'. x = 6 Simplifying x = 6
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