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Simplifying 21 = -8x + 3(x + -8) Reorder the terms: 21 = -8x + 3(-8 + x) 21 = -8x + (-8 * 3 + x * 3) 21 = -8x + (-24 + 3x) Reorder the terms: 21 = -24 + -8x + 3x Combine like terms: -8x + 3x = -5x 21 = -24 + -5x Solving 21 = -24 + -5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5x' to each side of the equation. 21 + 5x = -24 + -5x + 5x Combine like terms: -5x + 5x = 0 21 + 5x = -24 + 0 21 + 5x = -24 Add '-21' to each side of the equation. 21 + -21 + 5x = -24 + -21 Combine like terms: 21 + -21 = 0 0 + 5x = -24 + -21 5x = -24 + -21 Combine like terms: -24 + -21 = -45 5x = -45 Divide each side by '5'. x = -9 Simplifying x = -9
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