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Simplifying 8x + -21 = 6x + 9 Reorder the terms: -21 + 8x = 6x + 9 Reorder the terms: -21 + 8x = 9 + 6x Solving -21 + 8x = 9 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. -21 + 8x + -6x = 9 + 6x + -6x Combine like terms: 8x + -6x = 2x -21 + 2x = 9 + 6x + -6x Combine like terms: 6x + -6x = 0 -21 + 2x = 9 + 0 -21 + 2x = 9 Add '21' to each side of the equation. -21 + 21 + 2x = 9 + 21 Combine like terms: -21 + 21 = 0 0 + 2x = 9 + 21 2x = 9 + 21 Combine like terms: 9 + 21 = 30 2x = 30 Divide each side by '2'. x = 15 Simplifying x = 15
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