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Simplifying 21 + -4x = -5(4x + 3) + -5(-4 + -3x) Reorder the terms: 21 + -4x = -5(3 + 4x) + -5(-4 + -3x) 21 + -4x = (3 * -5 + 4x * -5) + -5(-4 + -3x) 21 + -4x = (-15 + -20x) + -5(-4 + -3x) 21 + -4x = -15 + -20x + (-4 * -5 + -3x * -5) 21 + -4x = -15 + -20x + (20 + 15x) Reorder the terms: 21 + -4x = -15 + 20 + -20x + 15x Combine like terms: -15 + 20 = 5 21 + -4x = 5 + -20x + 15x Combine like terms: -20x + 15x = -5x 21 + -4x = 5 + -5x Solving 21 + -4x = 5 + -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. 21 + -4x + 5x = 5 + -5x + 5x Combine like terms: -4x + 5x = 1x 21 + 1x = 5 + -5x + 5x Combine like terms: -5x + 5x = 0 21 + 1x = 5 + 0 21 + 1x = 5 Add '-21' to each side of the equation. 21 + -21 + 1x = 5 + -21 Combine like terms: 21 + -21 = 0 0 + 1x = 5 + -21 1x = 5 + -21 Combine like terms: 5 + -21 = -16 1x = -16 Divide each side by '1'. x = -16 Simplifying x = -16
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