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Simplifying -20 = 0.4x + -0.9x Combine like terms: 0.4x + -0.9x = -0.5x -20 = -0.5x Solving -20 = -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. -20 + 0.5x = -0.5x + 0.5x Combine like terms: -0.5x + 0.5x = 0.0 -20 + 0.5x = 0.0 Add '20' to each side of the equation. -20 + 20 + 0.5x = 0.0 + 20 Combine like terms: -20 + 20 = 0 0 + 0.5x = 0.0 + 20 0.5x = 0.0 + 20 Combine like terms: 0.0 + 20 = 20 0.5x = 20 Divide each side by '0.5'. x = 40 Simplifying x = 40
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