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Simplifying 21 + -5x = 9 + -8x Solving 21 + -5x = 9 + -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 + -5x + 8x = 9 + -8x + 8x Combine like terms: -5x + 8x = 3x 21 + 3x = 9 + -8x + 8x Combine like terms: -8x + 8x = 0 21 + 3x = 9 + 0 21 + 3x = 9 Add '-21' to each side of the equation. 21 + -21 + 3x = 9 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = 9 + -21 3x = 9 + -21 Combine like terms: 9 + -21 = -12 3x = -12 Divide each side by '3'. x = -4 Simplifying x = -4
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