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Simplifying 20x + -4 = 21x + 12 Reorder the terms: -4 + 20x = 21x + 12 Reorder the terms: -4 + 20x = 12 + 21x Solving -4 + 20x = 12 + 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. -4 + 20x + -21x = 12 + 21x + -21x Combine like terms: 20x + -21x = -1x -4 + -1x = 12 + 21x + -21x Combine like terms: 21x + -21x = 0 -4 + -1x = 12 + 0 -4 + -1x = 12 Add '4' to each side of the equation. -4 + 4 + -1x = 12 + 4 Combine like terms: -4 + 4 = 0 0 + -1x = 12 + 4 -1x = 12 + 4 Combine like terms: 12 + 4 = 16 -1x = 16 Divide each side by '-1'. x = -16 Simplifying x = -16
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