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Simplifying 9x + -21 = 8x + -15 Reorder the terms: -21 + 9x = 8x + -15 Reorder the terms: -21 + 9x = -15 + 8x Solving -21 + 9x = -15 + 8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8x' to each side of the equation. -21 + 9x + -8x = -15 + 8x + -8x Combine like terms: 9x + -8x = 1x -21 + 1x = -15 + 8x + -8x Combine like terms: 8x + -8x = 0 -21 + 1x = -15 + 0 -21 + 1x = -15 Add '21' to each side of the equation. -21 + 21 + 1x = -15 + 21 Combine like terms: -21 + 21 = 0 0 + 1x = -15 + 21 1x = -15 + 21 Combine like terms: -15 + 21 = 6 1x = 6 Divide each side by '1'. x = 6 Simplifying x = 6
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