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Simplifying 3x + -4 = 21 + -5x Reorder the terms: -4 + 3x = 21 + -5x Solving -4 + 3x = 21 + -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. -4 + 3x + 5x = 21 + -5x + 5x Combine like terms: 3x + 5x = 8x -4 + 8x = 21 + -5x + 5x Combine like terms: -5x + 5x = 0 -4 + 8x = 21 + 0 -4 + 8x = 21 Add '4' to each side of the equation. -4 + 4 + 8x = 21 + 4 Combine like terms: -4 + 4 = 0 0 + 8x = 21 + 4 8x = 21 + 4 Combine like terms: 21 + 4 = 25 8x = 25 Divide each side by '8'. x = 3.125 Simplifying x = 3.125
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