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Simplifying 2x + -4x + -21 = 0 Reorder the terms: -21 + 2x + -4x = 0 Combine like terms: 2x + -4x = -2x -21 + -2x = 0 Solving -21 + -2x = 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 + -2x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -2x = 0 + 21 -2x = 0 + 21 Combine like terms: 0 + 21 = 21 -2x = 21 Divide each side by '-2'. x = -10.5 Simplifying x = -10.5
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