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Simplifying 0.2x + 0.8x + -0.9 = 3.1 Reorder the terms: -0.9 + 0.2x + 0.8x = 3.1 Combine like terms: 0.2x + 0.8x = 1x -0.9 + 1x = 3.1 Solving -0.9 + 1x = 3.1 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + 1x = 3.1 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + 1x = 3.1 + 0.9 1x = 3.1 + 0.9 Combine like terms: 3.1 + 0.9 = 4 1x = 4 Divide each side by '1'. x = 4 Simplifying x = 4
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