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Simplifying 8x + 2x + -21 = 0 Reorder the terms: -21 + 8x + 2x = 0 Combine like terms: 8x + 2x = 10x -21 + 10x = 0 Solving -21 + 10x = 0 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 + 10x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 10x = 0 + 21 10x = 0 + 21 Combine like terms: 0 + 21 = 21 10x = 21 Divide each side by '10'. x = 2.1 Simplifying x = 2.1
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