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Simplifying 2x + 6x + 21 = 13 Reorder the terms: 21 + 2x + 6x = 13 Combine like terms: 2x + 6x = 8x 21 + 8x = 13 Solving 21 + 8x = 13 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 = 13 + -21 Combine like terms: 21 + -21 = 0 0 + 8x = 13 + -21 8x = 13 + -21 Combine like terms: 13 + -21 = -8 8x = -8 Divide each side by '8'. x = -1 Simplifying x = -1
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