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Simplifying 7x + 21 = 9x + 25 Reorder the terms: 21 + 7x = 9x + 25 Reorder the terms: 21 + 7x = 25 + 9x Solving 21 + 7x = 25 + 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 + 7x + -9x = 25 + 9x + -9x Combine like terms: 7x + -9x = -2x 21 + -2x = 25 + 9x + -9x Combine like terms: 9x + -9x = 0 21 + -2x = 25 + 0 21 + -2x = 25 Add '-21' to each side of the equation. 21 + -21 + -2x = 25 + -21 Combine like terms: 21 + -21 = 0 0 + -2x = 25 + -21 -2x = 25 + -21 Combine like terms: 25 + -21 = 4 -2x = 4 Divide each side by '-2'. x = -2 Simplifying x = -2
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