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Simplifying 2x + 1 = 21 + -7x Reorder the terms: 1 + 2x = 21 + -7x Solving 1 + 2x = 21 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. 1 + 2x + 7x = 21 + -7x + 7x Combine like terms: 2x + 7x = 9x 1 + 9x = 21 + -7x + 7x Combine like terms: -7x + 7x = 0 1 + 9x = 21 + 0 1 + 9x = 21 Add '-1' to each side of the equation. 1 + -1 + 9x = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 9x = 21 + -1 9x = 21 + -1 Combine like terms: 21 + -1 = 20 9x = 20 Divide each side by '9'. x = 2.222222222 Simplifying x = 2.222222222
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