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Simplifying x + 7x + 21 = 11 Reorder the terms: 21 + x + 7x = 11 Combine like terms: x + 7x = 8x 21 + 8x = 11 Solving 21 + 8x = 11 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 8x = 11 + -21 Combine like terms: 21 + -21 = 0 0 + 8x = 11 + -21 8x = 11 + -21 Combine like terms: 11 + -21 = -10 8x = -10 Divide each side by '8'. x = -1.25 Simplifying x = -1.25
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