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Simplifying 21 = 2x + 7x + -6 Reorder the terms: 21 = -6 + 2x + 7x Combine like terms: 2x + 7x = 9x 21 = -6 + 9x Solving 21 = -6 + 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 + -9x = -6 + 9x + -9x Combine like terms: 9x + -9x = 0 21 + -9x = -6 + 0 21 + -9x = -6 Add '-21' to each side of the equation. 21 + -21 + -9x = -6 + -21 Combine like terms: 21 + -21 = 0 0 + -9x = -6 + -21 -9x = -6 + -21 Combine like terms: -6 + -21 = -27 -9x = -27 Divide each side by '-9'. x = 3 Simplifying x = 3
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