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