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Simplifying 9x + 3 = 2x + 21 Reorder the terms: 3 + 9x = 2x + 21 Reorder the terms: 3 + 9x = 21 + 2x Solving 3 + 9x = 21 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 3 + 9x + -2x = 21 + 2x + -2x Combine like terms: 9x + -2x = 7x 3 + 7x = 21 + 2x + -2x Combine like terms: 2x + -2x = 0 3 + 7x = 21 + 0 3 + 7x = 21 Add '-3' to each side of the equation. 3 + -3 + 7x = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 7x = 21 + -3 7x = 21 + -3 Combine like terms: 21 + -3 = 18 7x = 18 Divide each side by '7'. x = 2.571428571 Simplifying x = 2.571428571
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