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Simplifying 3.1 = 3.9 + -0.4x Solving 3.1 = 3.9 + -0.4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4x' to each side of the equation. 3.1 + 0.4x = 3.9 + -0.4x + 0.4x Combine like terms: -0.4x + 0.4x = 0.0 3.1 + 0.4x = 3.9 + 0.0 3.1 + 0.4x = 3.9 Add '-3.1' to each side of the equation. 3.1 + -3.1 + 0.4x = 3.9 + -3.1 Combine like terms: 3.1 + -3.1 = 0.0 0.0 + 0.4x = 3.9 + -3.1 0.4x = 3.9 + -3.1 Combine like terms: 3.9 + -3.1 = 0.8 0.4x = 0.8 Divide each side by '0.4'. x = 2 Simplifying x = 2
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