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Simplifying 21 + 2x = 9x + 7 Reorder the terms: 21 + 2x = 7 + 9x Solving 21 + 2x = 7 + 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 = 7 + 9x + -9x Combine like terms: 2x + -9x = -7x 21 + -7x = 7 + 9x + -9x Combine like terms: 9x + -9x = 0 21 + -7x = 7 + 0 21 + -7x = 7 Add '-21' to each side of the equation. 21 + -21 + -7x = 7 + -21 Combine like terms: 21 + -21 = 0 0 + -7x = 7 + -21 -7x = 7 + -21 Combine like terms: 7 + -21 = -14 -7x = -14 Divide each side by '-7'. x = 2 Simplifying x = 2
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