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Simplifying 3 + 20x = 21x + 7 Reorder the terms: 3 + 20x = 7 + 21x Solving 3 + 20x = 7 + 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. 3 + 20x + -21x = 7 + 21x + -21x Combine like terms: 20x + -21x = -1x 3 + -1x = 7 + 21x + -21x Combine like terms: 21x + -21x = 0 3 + -1x = 7 + 0 3 + -1x = 7 Add '-3' to each side of the equation. 3 + -3 + -1x = 7 + -3 Combine like terms: 3 + -3 = 0 0 + -1x = 7 + -3 -1x = 7 + -3 Combine like terms: 7 + -3 = 4 -1x = 4 Divide each side by '-1'. x = -4 Simplifying x = -4
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