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Simplifying 5.3 = 8.1 + -0.4x Solving 5.3 = 8.1 + -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. 5.3 + 0.4x = 8.1 + -0.4x + 0.4x Combine like terms: -0.4x + 0.4x = 0.0 5.3 + 0.4x = 8.1 + 0.0 5.3 + 0.4x = 8.1 Add '-5.3' to each side of the equation. 5.3 + -5.3 + 0.4x = 8.1 + -5.3 Combine like terms: 5.3 + -5.3 = 0.0 0.0 + 0.4x = 8.1 + -5.3 0.4x = 8.1 + -5.3 Combine like terms: 8.1 + -5.3 = 2.8 0.4x = 2.8 Divide each side by '0.4'. x = 7 Simplifying x = 7
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