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