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Simplifying 8x + -21 = 3x + 4 Reorder the terms: -21 + 8x = 3x + 4 Reorder the terms: -21 + 8x = 4 + 3x Solving -21 + 8x = 4 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -21 + 8x + -3x = 4 + 3x + -3x Combine like terms: 8x + -3x = 5x -21 + 5x = 4 + 3x + -3x Combine like terms: 3x + -3x = 0 -21 + 5x = 4 + 0 -21 + 5x = 4 Add '21' to each side of the equation. -21 + 21 + 5x = 4 + 21 Combine like terms: -21 + 21 = 0 0 + 5x = 4 + 21 5x = 4 + 21 Combine like terms: 4 + 21 = 25 5x = 25 Divide each side by '5'. x = 5 Simplifying x = 5
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