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Simplifying -3(x + 7) + 8x = 4 Reorder the terms: -3(7 + x) + 8x = 4 (7 * -3 + x * -3) + 8x = 4 (-21 + -3x) + 8x = 4 Combine like terms: -3x + 8x = 5x -21 + 5x = 4 Solving -21 + 5x = 4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. 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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