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Simplifying 5(x + -4) + 20x = 21x + 4 Reorder the terms: 5(-4 + x) + 20x = 21x + 4 (-4 * 5 + x * 5) + 20x = 21x + 4 (-20 + 5x) + 20x = 21x + 4 Combine like terms: 5x + 20x = 25x -20 + 25x = 21x + 4 Reorder the terms: -20 + 25x = 4 + 21x Solving -20 + 25x = 4 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. -20 + 25x + -21x = 4 + 21x + -21x Combine like terms: 25x + -21x = 4x -20 + 4x = 4 + 21x + -21x Combine like terms: 21x + -21x = 0 -20 + 4x = 4 + 0 -20 + 4x = 4 Add '20' to each side of the equation. -20 + 20 + 4x = 4 + 20 Combine like terms: -20 + 20 = 0 0 + 4x = 4 + 20 4x = 4 + 20 Combine like terms: 4 + 20 = 24 4x = 24 Divide each side by '4'. x = 6 Simplifying x = 6
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