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Simplifying 2x + 9 + -7x = -21 Reorder the terms: 9 + 2x + -7x = -21 Combine like terms: 2x + -7x = -5x 9 + -5x = -21 Solving 9 + -5x = -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 + -5x = -21 + -9 Combine like terms: 9 + -9 = 0 0 + -5x = -21 + -9 -5x = -21 + -9 Combine like terms: -21 + -9 = -30 -5x = -30 Divide each side by '-5'. x = 6 Simplifying x = 6
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