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Simplifying 3x + -21 = 8x + 39 Reorder the terms: -21 + 3x = 8x + 39 Reorder the terms: -21 + 3x = 39 + 8x Solving -21 + 3x = 39 + 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 + 3x + -8x = 39 + 8x + -8x Combine like terms: 3x + -8x = -5x -21 + -5x = 39 + 8x + -8x Combine like terms: 8x + -8x = 0 -21 + -5x = 39 + 0 -21 + -5x = 39 Add '21' to each side of the equation. -21 + 21 + -5x = 39 + 21 Combine like terms: -21 + 21 = 0 0 + -5x = 39 + 21 -5x = 39 + 21 Combine like terms: 39 + 21 = 60 -5x = 60 Divide each side by '-5'. x = -12 Simplifying x = -12
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