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Simplifying 9x + 21 = 20 + -1 Reorder the terms: 21 + 9x = 20 + -1 Combine like terms: 20 + -1 = 19 21 + 9x = 19 Solving 21 + 9x = 19 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 + 9x = 19 + -21 Combine like terms: 21 + -21 = 0 0 + 9x = 19 + -21 9x = 19 + -21 Combine like terms: 19 + -21 = -2 9x = -2 Divide each side by '9'. x = -0.2222222222 Simplifying x = -0.2222222222
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