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Simplifying 21 = 0.5x + -1x Combine like terms: 0.5x + -1x = -0.5x 21 = -0.5x Solving 21 = -0.5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5x' to each side of the equation. 21 + 0.5x = -0.5x + 0.5x Combine like terms: -0.5x + 0.5x = 0.0 21 + 0.5x = 0.0 Add '-21' to each side of the equation. 21 + -21 + 0.5x = 0.0 + -21 Combine like terms: 21 + -21 = 0 0 + 0.5x = 0.0 + -21 0.5x = 0.0 + -21 Combine like terms: 0.0 + -21 = -21 0.5x = -21 Divide each side by '0.5'. x = -42 Simplifying x = -42
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